[Xon] Search Improvements 2.17.1

A collection of improvements to XF's Enhanced Search and some for XenForo's default MySQL search.

MySQL & Elastic Search features;

• range_query search DSL
  • allows arbitrary range queries for numerical data
• Allow users to select the default search order independent for the forum wide setting.

Elastic Search Only features:

• Per content type weighting
• Adds Elastic Search information to the AdminCP home screen.
• Adds a debug option to log the...

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• Fix the "Default search order" option would get reset when changing "Search options" under Enhanced Search Setup page

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This feature is powering tag autocomplete and username autocomplete which supports partial matches, and non-prefix lookups on SpaceBattles.

• Require XenForo 2.2+, removes xf2.0/xf2.1 support
• Add "Specialized index" support
  • Specialized search index allows generating single-purpose elastic search indexes while re-using as much XF search infrastructure as possible.
    • Elasticsearch index is more akin to an SQL table than an entire database, so for very specific...

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• Fix "array_fill_keys() expects parameter 1 to be array, null given" error when content weighting has not been configured

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• Fix incorrectly adding a return type to XF\Search\Search::isValidContentType
• Fix typo in admincp options phrase

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• Fix bug where 'weight by content type' feature didn't work as expected in general search
• Thanks to @NamePros for sponsoring this update.
• Display various search term constraints on the search results form.
  For developers to implement support in 3rd party add-ons:
  • Each search constraint needs a svSearchConstraint. prefixed phrase.
    Arrays are mapped to phrases by adding a _ for each sub-array/key as such; c[warning][points][lower] =>...

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• Remove usage of utf8_* function(s), and use native php multi-byte functions instead.
• Fix HTML markup error in svPushViewOtherCheckIntoXFES option description

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• Fix "before" search result term would print an integer instead of a human readable yyyy-mm-dd formatted string
• Change 'no results found' handling to display search terms on the relevent page
  • If using ElasticSearch Essentials, recommend updating to v3.13.0+ as this change may impact some options which display on no results found.
• Fixes for search term on results page
  • Add missing "With X thread" search term
  • Fix "Users" search term could fail to...

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• Fix cached search results would be unexpectedly be viewable to anyone if they guessed the search result URL.
  • Affected versions; v2.8.1
  • These search URLs expire after a day
• Fix search term on search result pages leaking information for non-viewable content
  • Affected version; v2.7.4, v2.7.5 and v2.8.1
  • Fix leaking thread title when using "In thread" search area, and rendering a bad phrase if the thread doesn't exist
  • Fix linking to non-active user...

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• Fix searching by member without a keyword for a guest

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