Move Benchmark release to 1.3
[BUILD] Fixed release notes script to work with github API again
Remove `DocIdSets.isFastIterator(DocIdSetIterator iterator)`.

This method was unused and its implementation wasn't correct since FixedBitSet
has its own iterator since Lucene 4.7.
XFilteredQuery default strategy prefers query first in the deleted docs case

Today we check if the DocIdSet we filter by is `fast` but the check fails
if the DocIdSet if wrapped in an `ApplyAcceptedDocsFilter` which is always
the case if the index has deleted documents. This commit unwraps
the original DocIdSet in the case of deleted documents.

Closes #6247