Changes

Core

Check if the index exists before checking it's properties
Make sure to initialize maps on update of value in query engine
Add name to the OrientDB internal timer
Removed optimization in query engine that cause failing to update linked records, issue #10077
Corrected query with content of nested JSON documents to use embedded class
Add count on the create link result set
Make sure to call on drop on database drop
Double Write Log is fsynced on writes. Looks like usage of SYNC flag is not enough
Double Write Log is not truncated on file flush but only if it reaches file limit
Double Write Log is truncated every time there are tail segments in queue
We do not need to make fsync during Write Ahead Log truncation it will be forced by Double Write Log itself
sync flag is removed for Double Write Log channel because we perform sync on data write
Dirty counter is updated on write sync