ElasticSearch Essentials 3.15.9

• Fix unexpected additional searches on no results for searches with no keywords could be triggered when "Enable suggestions only for the first page of search results" is enabled

Users who had thier licence expire since the last update and this update, have had a licence expension applied.

• Fix not removing 3rd party content types a user can't search from general search, resulting in search result pages showing less results than expected, which cam be used as an oracle to determine if a phrase exists.
• Fix possible case where 'recent content' tab could leak posts from forums which users did not have 'view threads by others' permission due to incomplete permission checks

• Workaround for XF bug where search results are fetched more than once
• Fix "Call to undefined method canViewSimilarContents()" during add-on upgrade
• Implement MySQL-base caching for similar thread results, as otherwise ElasticSearch may be overloaded by uncached queries
  • Redis/Memcache-based caching is still strongly recommended.
• Improve autocomplete & similar thread performance for forums with large number of nodes by avoiding fetching the entire node list every autocomplete/similar threads query.

• Fix unexpected additional queries from ESE similar thread widget
• Fix v3.10.x regression where similar threads performance was made worse and would ignore the "limit similar thread results by" option
• Fix disabling "Replace Enhanced Search 2.2's suggest threads implementation" option wasn't being fully respected
• Implement "Same forum boost amount" option from XFES with ESE similar threads
• Add "Push specific content type permission checks into global autocomplete" option
  • This is default disabled for forums with >1000 forum nodes

• Fix "Limit autocomplete results by" not applying for non-thread types
• Fix "Limit autocomplete results by" not being applied from the global search scope (ie everywhere)

• On upgrade, ensure the installer checks 3rd party integration schema changes are applies (Aka actually fix Tickets support.)

• Fix elasticsearch essentials "ess_limit_autocomplete" column not being correctly added for NixFifty's tickets add-on which blocks new Ticket Categories being created.

• Require php 7.2+
• Fix that elasticsearch could be queried for impossible queries when searching taggable/groupable's which aren't possible
• Fix XFES similar thread would cause an extra query when "Replace Enhanced Search 2.2's suggest threads implementation" was disabled.
• Add autocomplete support for NixFifty's Tickets add-on (v2.4.0+)
• Add 'most recent' search sort type support for Tickets
• Support content tooltips from autocomplete

• Include 'Browser Detection' add-on in download list.
• Actually distribute readme file for the xf-rebuild:search-bulk command
• Rename the nonsenically named search option from "Search only containers" to "Search first posts only".

• Compatibility tweak for upcoming add-on related to tagging