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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3900?atlOrigin=eyJpIjoiN2FiZjAyNzAwMmY3NGQzMDgzYTExZGMxMWI5MTQwMDMiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Re: drop-and-create strategy is not working at app. startup when "hibernate.search.autoregister_listeners" is set to false. And if true, startup index creation thread are not released, sending the app in out of memory.</a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">As I explained at length in my answer to your <a href="https://stackoverflow.com/questions/61405928/hibernate-search-creating-unnecessary-threads-to-index-data-on-server-startup-wi/61406792?noredirect=1#comment108684126_61406792" class="external-link" rel="nofollow noreferrer" style="color: #3b73af; text-decoration: none">stackoverflow question</a>, setting <tt>autoregister_listeners</tt> to <tt>false</tt> disables Hibernate Search completely, and that has been the case since Hibernate Search <tt>5.5</tt> at the very least. So this setting is unlikely to have anything to do with your problem.</p> <p style="margin: 10px 0 0">You're mentioning many refresh operations on Elasticsearch's side. Did you by any chance set <tt>hibernate.search.default.elasticsearch.refresh_after_write</tt> to <tt>true</tt>? Because that's bound to hurt performance *<b>a lot</b>*. So much so that we explained you shouldn't enable it in the documentation:</p>
<blockquote style="margin: 10px 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin: 10px 0 0; margin-top: 0">You should not rely on the synchronous behaviour for your production code except in rare cases as Elasticsearch is optimised for asynchronous writes: leave at false for optimal performance.</p>
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