When creating a new thread, the similar threads dropdown will stay open. Added a cancel button to allow closing the similar threads dropdown during thread creation.
Fixed issue with thread title having "|" character.
Fixed issue with thread title having multiple "+" characters.
Similar threads results block now has scrollbar to allow viewing additional results.
Fixed issue with Elasticsearch 7.6.0 causing server error logs.
Added bottom margin to similar threads block. Also updated PHP code to prevent server error logs if elasticsearch is not available.