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project, what you can do, where to find things"><span>Community portal</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Special:RecentChanges" title="A list of recent changes in the wiki [r]" accesskey="r"><span>Recent changes</span></a></li><li id="n-mw-translate" class="mw-list-item"><a href="/wiki/Special:LanguageStats"><span>Translate content</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Special:Random" title="Load a random page [x]" accesskey="x"><span>Random page</span></a></li><li id="n-mw-discussion" class="mw-list-item"><a href="/wiki/Project:Village_Pump"><span>Village pump</span></a></li><li id="n-Sandboxlink-portlet-label" class="mw-list-item"><a href="/wiki/Project:Sandbox"><span>Sandbox</span></a></li> </ul> </div> </div> <div id="p-lang" class="vector-menu mw-portlet mw-portlet-lang" > <div class="vector-menu-heading"> In other languages </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-add wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:NewItem?site=mediawikiwiki&page=Wikimedia+Discovery%2FSearch" title="Add interlanguage links" class="wbc-editpage">Add links</a></span></div> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/MediaWiki" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/mediawikiwiki.svg" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="MediaWiki" src="/static/images/mobile/copyright/mediawikiwiki-wordmark.svg" style="width: 7.5em; height: 1.125em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Special:Search" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Search MediaWiki [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Search</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Search MediaWiki" aria-label="Search MediaWiki" autocapitalize="sentences" title="Search MediaWiki [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Special:Search"> </div> <button class="cdx-button cdx-search-input__end-button">Search</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Personal tools"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-uls" class="mw-list-item active user-links-collapsible-item"><a data-mw="interface" href="#" class="uls-trigger cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet"><span class="vector-icon mw-ui-icon-wikimedia-language mw-ui-icon-wikimedia-wikimedia-language"></span> <span>English</span></a> </li> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" 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mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="https://donate.wikimedia.org/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=www.mediawiki.org&uselang=en" class=""><span>Donate</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:CreateAccount&returnto=Wikimedia+Discovery%2FSearch" title="You are encouraged to create an account and log in; however, it is not mandatory" class=""><span>Create account</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:UserLogin&returnto=Wikimedia+Discovery%2FSearch" title="You are encouraged to log in; however, it is not mandatory [o]" accesskey="o" class=""><span>Log in</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="More options" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Personal tools" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Personal tools</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="User menu" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="https://donate.wikimedia.org/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=www.mediawiki.org&uselang=en"><span>Donate</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:CreateAccount&returnto=Wikimedia+Discovery%2FSearch" title="You are encouraged to create an account and log in; however, it is not mandatory"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Create account</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:UserLogin&returnto=Wikimedia+Discovery%2FSearch" title="You are encouraged to log in; however, it is not mandatory [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Log in</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pages for logged out editors <a href="/wiki/Help:Introduction" aria-label="Learn more about editing"><span>learn more</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Special:MyContributions" title="A list of edits made from this IP address [y]" accesskey="y"><span>Contributions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Special:MyTalk" title="Discussion about edits from this IP address [n]" accesskey="n"><span>Talk</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contents" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 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vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Rationale"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Rationale</span> </div> </a> <ul id="toc-Rationale-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Search_metrics" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Search_metrics"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Search metrics</span> </div> </a> <ul id="toc-Search_metrics-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Documents" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Documents"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Documents</span> </div> </a> <ul id="toc-Documents-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Wikimedia Discovery/Search</span></h1> <div class="mw-indicators"> <div id="mw-indicator-phabricator-project" class="mw-indicator"><div class="mw-parser-output"><div class="mw-parser-output"><style data-mw-deduplicate="TemplateStyles:r6605561">.mw-parser-output .tpl-badge{background-color:var(--background-color-progressive-subtle,#eaf3ff);color:var(--color-base,#202122);border-radius:10px;display:inline-block;font-size:90%;padding:5px 8px}</style><div class="tpl-badge"><a href="/wiki/Special:MyLanguage/Phabricator" title="Special:MyLanguage/Phabricator">Issue tracker</a>: <a href="https://phabricator.wikimedia.org/tag/discovery-search-sprint/" class="extiw" title="phab:tag/discovery-search-sprint/"><b>#discovery-search-sprint</b></a></div></div></div></div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Wikimedia_Discovery/Search" title="View the content page [c]" accesskey="c"><span>Page</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Talk:Wikimedia_Discovery/Search&action=edit&redlink=1" rel="discussion" class="new" title="Discussion about the content page (page does not exist) [t]" accesskey="t"><span>Discussion</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Change language variant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">English</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" 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accesskey="e"><span>Edit</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=Wikimedia_Discovery/Search&action=history"><span>View history</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> General </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Special:WhatLinksHere/Wikimedia_Discovery/Search" title="A list of all wiki pages that link here [j]" accesskey="j"><span>What links here</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Special:RecentChangesLinked/Wikimedia_Discovery/Search" rel="nofollow" title="Recent changes in pages linked from this page [k]" accesskey="k"><span>Related changes</span></a></li><li id="t-upload" class="mw-list-item"><a href="//commons.wikimedia.org/wiki/Special:UploadWizard" title="Upload files [u]" accesskey="u"><span>Upload file</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Special:SpecialPages" title="A list of all special pages [q]" accesskey="q"><span>Special pages</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=Wikimedia_Discovery/Search&oldid=5354833" title="Permanent link to this revision of this page"><span>Permanent link</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=Wikimedia_Discovery/Search&action=info" title="More information about this page"><span>Page information</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Special:CiteThisPage&page=Wikimedia_Discovery%2FSearch&id=5354833&wpFormIdentifier=titleform" title="Information on how to cite this page"><span>Cite this page</span></a></li><li id="t-urlshortener" class="mw-list-item"><a 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id="mw-content-subtitle"><div class="subpages">< <bdi dir="ltr"><a href="/wiki/Wikimedia_Discovery" title="Wikimedia Discovery">Wikimedia Discovery</a></bdi></div></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r6870138">.mw-parser-output table.ambox{margin:0 10%;width:unset;border:1px solid var(--border-color-base,#a2a9b1);border-left:10px solid var(--border-color-progressive,#36c);background-color:var(--background-color-neutral-subtle,#f8f9fa);box-sizing:border-box}.mw-parser-output table.ambox+table.ambox,.mw-parser-output table.ambox+link+table.ambox,.mw-parser-output table.ambox+style+table.ambox{margin-top:-1px}.mw-parser-output .ambox td.mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox th.mbox-text,.mw-parser-output .ambox td.mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox td.mbox-image{padding:2px 0 2px 0.5em}.mw-parser-output .ambox td.mbox-imageright{padding:2px 0.5em 2px 0}.mw-parser-output table.ambox-notice{border-left-color:var(--border-color-progressive,#36c)}.mw-parser-output table.ambox-speedy{background-color:var(--background-color-error-subtle,#fee7e6)}.mw-parser-output table.ambox-delete,.mw-parser-output table.ambox-speedy{border-left-color:var(--background-color-error--active,#b32424)}.mw-parser-output table.ambox-content{border-left-color:#f28500}.mw-parser-output table.ambox-style{border-left-color:#fc3}.mw-parser-output table.ambox-move{border-left-color:#9932cc}.mw-parser-output table.ambox-protection{border-left-color:var(--border-color-base,#a2a9b1)}html body.mediawiki .mw-parser-output .ambox.mbox-small{clear:right;float:right;margin:4px 0 4px 1em;box-sizing:border-box;width:238px;font-size:88%;line-height:1.25em}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;box-sizing:border-box;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}</style><table class="ambox-notice box-Notice ambox plainlinks metadata" role="presentation"><tbody><tr><td class="mbox-image"><div style="width:52px"><span typeof="mw:File"><a href="/wiki/File:Historical.svg" class="mw-file-description" title="Notice"><img alt="Notice" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/56/Historical.svg/40px-Historical.svg.png" decoding="async" width="40" height="51" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/56/Historical.svg/60px-Historical.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/56/Historical.svg/80px-Historical.svg.png 2x" data-file-width="140" data-file-height="177"/></a></span></div></td><td class="mbox-text"><div class="mbox-text-span"><b>This page is obsolete. It is being retained for archival purposes.</b> It may document extensions or features that are obsolete and/or no longer supported. Do not rely on the information here being up-to-date.</div></td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r6651102">.mw-parser-output .infobox{box-sizing:border-box;border:2px solid var(--border-color-base,#a2a9b1);width:280px;border-collapse:collapse;border-spacing:0;background-color:white;color:#333;clear:right;float:right;margin:0 0 0.5em 0.5em}.mw-parser-output .infobox-rtl{clear:left;float:left;margin:0 0.5em 0.5em 0}.mw-parser-output .infobox th{text-align:left;padding:0.2em 0.5em;vertical-align:top}.mw-parser-output .infobox-rtl th{text-align:right}@media(max-width:719px){body.mediawiki .mw-parser-output .infobox{float:none;clear:both;width:100%;margin:0 0 .5em 0}}.mw-parser-output .infobox td{border:none;padding:0.2em 0.5em;vertical-align:top}.mw-parser-output .infobox-header{background-color:#a2a9b1;color:#FFF;text-align:left}.mw-parser-output .infobox-header a{color:#FFF}.mw-parser-output .infobox-header td,.mw-parser-output .infobox-header th{padding:0.5em 0.5em}.mw-parser-output .infobox-header img{padding:0 0.2em 0 0.5em}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox{background-color:inherit;color:inherit}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox{background-color:inherit;color:inherit}}</style><style data-mw-deduplicate="TemplateStyles:r6651116">.mw-parser-output .wmf-engineering-project-box{border:1px solid #eaecf0;padding:.2em;width:300px;background:#f8f9fa;color:#222}.mw-parser-output .wmf-engineering-project-box-catlink{font-size:smaller;margin:.2em;text-align:center}.mw-parser-output .wmf-engineering-project-box-title{font-size:1.2em;margin:.2em;background:#14866d;color:#fff;padding:.5em;text-align:center;font-weight:bold}.mw-parser-output .wmf-engineering-project-box-description{margin:.2em;padding:.2em;font-style:italic}.mw-parser-output .wmf-engineering-project-box-data{font-size:.9em;margin:.2em 0;width:100%}.mw-parser-output .wmf-engineering-project-box-data th{width:25%;font-weight:normal}.mw-parser-output .wmf-engineering-project-box-previous,.mw-parser-output .wmf-engineering-project-box-next{font-size:smaller;margin:.2em}.mw-parser-output .infobox-ltr .wmf-engineering-project-box-previous,.mw-parser-output .infobox-rtl .wmf-engineering-project-box-next{float:left}.mw-parser-output .infobox-ltr .wmf-engineering-project-box-next,.mw-parser-output .infobox-rtl .wmf-engineering-project-box-previous{float:right}@media screen{html.skin-theme-clientpref-night .mw-parser-output .wmf-engineering-project-box{background:transparent;color:inherit}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .wmf-engineering-project-box{background:transparent;color:inherit}}</style> <table class="infobox infobox-ltr wmf-engineering-project-box plainlinks"><tbody><tr><td> <div class="nomobile wmf-engineering-project-box-catlink"><a href="/wiki/Special:MyLanguage/Category:WMF_Projects" title="Special:MyLanguage/Category:WMF Projects">Wikimedia Foundation projects</a><span style="display:none"><a href="/wiki/Category:WMF_Projects" title="Category:WMF Projects"> </a></span></div> <div class="wmf-engineering-project-box-title">Search</div> <div class="wmf-engineering-project-box-description">Search infrastructure improvements and maintenance</div> <table class="wmf-engineering-project-box-data"> <tbody><tr> <th scope="row">Group:</th> <td><a href="/wiki/Discovery" class="mw-redirect" title="Discovery">Discovery</a></td> </tr> <tr> <th scope="row">Start:</th> <td>2015-04-21</td> </tr> <tr> <th scope="row">End:</th> <td>2017-12-01</td> </tr> <tr> <th scope="row">Team members:</th> <td><a href="/wiki/User:EBernhardson_(WMF)" title="User:EBernhardson (WMF)">Erik Bernhardson</a>, <a href="/wiki/User:DCausse_(WMF)" title="User:DCausse (WMF)">David Causse</a>, <a href="/wiki/User:TJones_(WMF)" title="User:TJones (WMF)">Trey Jones</a>, <a href="/wiki/User:GLederrey_(WMF)" title="User:GLederrey (WMF)">Guillaume Lederrey</a>, <a href="/wiki/User:Smalyshev_(WMF)" title="User:Smalyshev (WMF)">Stas Malyshev</a>, <a href="/wiki/User:MPopov_(WMF)" title="User:MPopov (WMF)">Mikhail Popov</a>, and <a href="/wiki/User:CXie_(WMF)" title="User:CXie (WMF)">Chelsy Xie</a></td> </tr> <tr> <th scope="row">Backlog:</th> <td><a href="https://phabricator.wikimedia.org/tag/discovery-search-sprint/" class="extiw" title="phab:tag/discovery-search-sprint/">#discovery-search-sprint</a></td> </tr> <tr> <th scope="row">Lead:</th> <td><a href="/wiki/User:DTankersley_(WMF)" title="User:DTankersley (WMF)">Deb Tankersley</a> (product) and <a href="/wiki/User:EBjune_(WMF)" title="User:EBjune (WMF)">Erika Bjune</a> (engineering)</td> </tr> <tr> <th scope="row">Updates:</th> <td><a href="/wiki/Discovery/Status_updates" title="Discovery/Status updates">Status updates</a></td> </tr> <tr class="mw-empty-elt"> </tr></tbody></table></td></tr></tbody></table> <dl><dd><i>See <a href="/wiki/Help:Searching" title="Help:Searching">Help:Searching</a> for a basic user guide, <a href="/wiki/Help:CirrusSearch" title="Help:CirrusSearch">Help:CirrusSearch</a> for an FAQ and a list of key features of the software component.</i></dd></dl> <p>This page describes the Wikimedia Foundation's <a href="/wiki/Wikimedia_Discovery" title="Wikimedia Discovery">Discovery department</a> activities surrounding our sites' search functionality. Our current project is to improve our <a href="https://en.wikipedia.org/wiki/Elasticsearch" class="extiw" title="w:Elasticsearch">Elasticsearch</a> search system (using an extension called <a href="/wiki/Extension:CirrusSearch" title="Extension:CirrusSearch">CirrusSearch</a>). </p> <meta property="mw:PageProp/toc"/> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Current_work" data-mw-thread-id="h-Current_work"><span data-mw-comment-start="" id="h-Current_work"></span>Current work<span data-mw-comment-end="h-Current_work"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikimedia_Discovery/Search&action=edit&section=1" title="Edit section: Current work"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <dl><dd><i>See <a href="/wiki/Wikimedia_Discovery#Search" title="Wikimedia Discovery">Discovery's current quarter goals</a></i></dd></dl> <p>Wikimedia search has an <a href="https://en.wikipedia.org/wiki/en:incremental_search" class="extiw" title="w:en:incremental search">incremental search</a> <a href="/wiki/Extension:CirrusSearch/CompletionSuggester" title="Extension:CirrusSearch/CompletionSuggester">completion suggester</a> that is in active development. The team has improved this feature with better handling of typos and better ranking of possible matches in the suggested articles. Work continues to add real-time index updates to the completion suggester and improve overall stability and performance of search by upgrading to the latest version of <a href="https://en.wikipedia.org/wiki/en:Elasticsearch" class="extiw" title="w:en:Elasticsearch">Elasticsearch</a>. </p><p>This feature was available from December 2015 to March 2016 as a beta feature. </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Rationale" data-mw-thread-id="h-Rationale"><span data-mw-comment-start="" id="h-Rationale"></span>Rationale<span data-mw-comment-end="h-Rationale"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikimedia_Discovery/Search&action=edit&section=2" title="Edit section: Rationale"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The Wikimedia search is an important component to the discovery of knowlege within our projects.... </p><p>Goals for our current quarter: </p> <ul><li>Enhance search results and expose users to other interesting content by improving interwiki search integration.</li> <li>Adding real-time index updates to completion suggester and improve overall stability and performance of search by upgrading to Elasticsearch 2.x.</li></ul> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Search_metrics" data-mw-thread-id="h-Search_metrics"><span data-mw-comment-start="" id="h-Search_metrics"></span>Search metrics<span data-mw-comment-end="h-Search_metrics"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikimedia_Discovery/Search&action=edit&section=3" title="Edit section: Search metrics"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Key performance indicators of how search is working can be found on the search metrics dashboard at <a rel="nofollow" class="external free" href="http://discovery.wmflabs.org/metrics/">http://discovery.wmflabs.org/metrics/</a> </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Documents" data-mw-thread-id="h-Documents"><span data-mw-comment-start="" id="h-Documents"></span>Documents<span data-mw-comment-end="h-Documents"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikimedia_Discovery/Search&action=edit&section=4" title="Edit section: Documents"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/TextCat" title="TextCat">TextCat</a>—a software component used for doing language detection</li> <li>How Elasticsearch breaks <a rel="nofollow" class="external text" href="http://nik9000.github.io/2015/06/24/how-elasticsearch-breaks.html">Part 1</a> <a rel="nofollow" class="external text" href="http://nik9000.github.io/2015/07/01/how-elasticsearch-breaks-part-2.html">Part 2</a></li> <li><a href="/wiki/Wikimedia_Discovery/2015_Notes_on_unbreaking_and_optimizing_elasticsearch" title="Wikimedia Discovery/2015 Notes on unbreaking and optimizing elasticsearch">2015 Notes on unbreaking and optimizing elasticsearch</a></li> <li><a href="/wiki/Wikimedia_Discovery/Search/Testing_Search" class="mw-redirect" title="Wikimedia Discovery/Search/Testing Search">Testing Search</a>—testing search changes is complicated!</li></ul> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="See_also" data-mw-thread-id="h-See_also"><span data-mw-comment-start="" id="h-See_also"></span>See also<span data-mw-comment-end="h-See_also"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikimedia_Discovery/Search&action=edit&section=5" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a class="external text" href="https://phabricator.wikimedia.org/project/board/1227/query/open/">Phabricator workboard</a> showing current work of the team.</li> <li><a rel="nofollow" class="external text" href="http://discovery.wmflabs.org/metrics/">Search metrics on the Discovery dashboards</a></li> <li><a class="external text" href="https://grafana.wikimedia.org/dashboard/db/elasticsearch-percentiles">Elasticsearch stats on Grafana</a></li> <li><a href="/wiki/Help:CirrusSearch" title="Help:CirrusSearch">Help:CirrusSearch</a> - Information on how the Wikimedia search works. <ul><li><a href="/wiki/Extension:CirrusSearch/CompletionSuggester" title="Extension:CirrusSearch/CompletionSuggester">Completion Suggester</a> - incremental search</li></ul></li> <li><a href="/wiki/Cross-wiki_Search_Result_Improvements" title="Cross-wiki Search Result Improvements">Cross-wiki Search Result Improvements</a></li> <li><a href="/wiki/Wikimedia_Discovery/BrowserBot" title="Wikimedia Discovery/BrowserBot">BrowserBot</a> - a browser test bot for search</li> <li><a href="/wiki/User:TJones_(WMF)/Notes/Top_Unsuccessful_Search_Queries" title="User:TJones (WMF)/Notes/Top Unsuccessful Search Queries">Top Unsuccessful Search Queries</a> - The difficulties in creating a list of unsuccessful search results.</li></ul> <p><br/> </p> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r6870138"><table class="ambox ambox-notice plainlinks metadata" role="presentation"><tbody><tr><td class="mbox-image"><div style="width:52px"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/OOjs_UI_icon_information-progressive.svg/40px-OOjs_UI_icon_information-progressive.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/OOjs_UI_icon_information-progressive.svg/60px-OOjs_UI_icon_information-progressive.svg.png 1.5x, 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