[Build] splitted release commits into version and feature flag commits

Elasticsearch is release from release-branches but the modifications
to the documentation must be cherry-picked into the current development
branch. To make this easier this commit splits the commits of the
Version and the documenation into seperate commits.
[Docs] Add coming tag for context suggester docs
BytesReference.Helper should never materialize a byte[] array.

The current implementations of BytesReference.Helper.bytesEquals and
bytesHashCode materialize a byte[] when passed an instance that returns `false`
in `hasArray()`. They should instead do a byte-by-byte comparison/hashcode
computation without materializing the array.

Close #5517
[DOCS] Moved the template query documentation into search section
Let ByteArray/BigByteArray.get() indicate whether a byte[] was
materialized.
Fix include_in_all for multi field, to not include multi fields into _all field.

Closes #5522