Log warning in case of double release of the IndexSearcher instead of throwing an exception.
Wait for green in mlt tests
[DOCS] Updated cross-doc refs in the 0.90 branch
Bulk process of shard started/failed should not execute on already processed events
closes #5061
add version to cluster state xcontent
Set high refresh setting in get_source realtime tests to make sure it doesn't kick in
[TEST] Fixed delete/50_refresh REST test to work against multiple nodes

delete/50_refresh tests per shard refresh using refresh:true in delete api. We might run into troubles though if we have a replica that gets initialized after a doc was indexed and deleted, without a refresh, as that doc won't be found when searching against that specific replica shard (as a refresh happens automatically before a replica gets exposed as started).
[TEST] Fixed get_source/60_realtime_refresh REST test to work against multiple nodes

Replaced also wait for yellow with wait for green when using no replicas.

get_source/60_realtime_refresh tests per shard refresh using refresh:true and realtime:true in get api. We might run into troubles though if we have a replica that gets initialized after a doc was indexed without a refresh, as that doc will be found when searching against that specific replica shard (as a refresh happens automatically before a replica gets exposed as started).
[TEST] moved routing REST tests to 0 replicas

REST tests get run against either 1 node or multiple nodes. Wait for yellow with replicas>0 is not enough when running against multiple nodes as replicas shard might get initialized  during testing, which can cause timing issues.
Fix AndDocIdSet#IteratorBasedIterator to not violate initial doc state

AndDocIdSet#IteratorBasedIterator was potentially initialized with
NO_MORE_DOCS which violates the initial state of DocIdSetIterator and
could lead to undefined behavior when used in a search context.

Closes #5049
[DOCS] Add GitHub community river plugin
[DOCS] adding a note on python client versioning schema
Beefed up DeleteByQueryTests to run not just against a single document
[TEST] disabled replicas in validate query test
Minor cleanups in ShardsLimitAllocationDecider
[DOCS] Documented `discovery.zen.publish_timeout` setting
Improved ClusterSettingsTests

more assertAcked, removed restriction on number of nodes, doesn't seem needed.
[DOCS] add DynamoDB river plugin
add elasticsearch-osem to integrations page
Fix typo in similarity docs

DRF similarity -> DFR similarity