xF1 Add-on Conversation Improvements by Xon 1.3.15

• Fix error when indexing conversation messages with DragonTech credits installed

• Elasticsearch v6 single-type support is complex so move it into https://www.null-scripts.net/resources/enhanced-search-improvements.606

• Fix "Undefined index: recipient_state" when interacting with other add-ons

• Fix breaking listing conversations due to too aggressive pruning fetched conversation data (it should only have applied during search indexing)

• This release will unblock upgrading from XF1.x to XF2.x

• Add "Display results as conversations" to quick search drop-down, as this option exists from the advanced conversation search.

Fix compatibility issue with Conversation Essentials

• Do not use the thread prefix helper for conversations

• Improve compatibility with Digital Point Search

• Improve custom theme compatibility when inserting message history anchor
• Fix indexing of conversation messages.
  • This will require a rebuild of conversation/conversation messages to catch missed messages

• Improve compatibility for extending Elasticsearch Optimize Mapping process