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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-3534?atlOrigin=eyJpIjoiNGJjMTg5NzIzZDY4NDk3ZGJkMTU0NjE4ODQ3N2VkODgiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Re: Should filtering differently when index-manager is elasticsearch in compare to directory-based for same mapping and data set</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">Thanks for the report and the test cases, now I see what you meant.</p> <p style="margin: 10px 0 0">I pushed your patches to a fork of the repo for future reference: <a href="https://github.com/yrodiere/hibernate-test-case-templates/tree/HSEARCH-3534/" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/yrodiere/hibernate-test-case-templates/tree/HSEARCH-3534/</a></p> <p style="margin: 10px 0 0">Now, the problem. If I understand correctly, the Elasticsearch team decided it would be a good idea for the boolean junctions to behave differently when they are nested under a <tt>filter</tt>/<tt>must_not</tt> clause than when they are not:</p>
<ol>
<li>If the bool query is in a query context and has a must or filter clause then a document will match the bool query even if none of the should queries match. In this case these clauses are only used to influence the score.</li>
<li>If the bool query is a filter context or has neither must or filter then at least one of the should queries must match a document for it to match the bool query. This behavior may be explicitly controlled by settings the minimum_should_match parameter.</li>
</ol> <p style="margin: 10px 0 0">Source: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/5.6/query-dsl-bool-query.html" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://www.elastic.co/guide/en/elasticsearch/reference/5.6/query-dsl-bool-query.html</a></p> <p style="margin: 10px 0 0">This effectively means that <tt>minimum_should_match</tt> defaults to 0 in the first case, and to 1 in the second case.</p> <p style="margin: 10px 0 0">The thing is, this is completely arbitrary and not something we have in Lucene at all.</p> <p style="margin: 10px 0 0">I can see three solutions:</p>
<ol>
<li>We change the Lucene backend to implement the same behavior. That might be a bit difficult to achieve, in particular when the user doesn't rely on our DSL. But more importantly, that will be surprising to people already familiar with Lucene.</li>
<li>We change the Elasticsearch backend to work around these defaults and force Lucene's defaults instead. This will be surprising to people already familiar with Elasticsearch.</li>
<li>We don't change anything, and simply document this oddity.</li>
</ol> <p style="margin: 10px 0 0">1 seems dodgy, but option 2 seems more reasonable. And a few tests show that it's possible. Let's try to do it, at least in 6.</p> </td>
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