[7.7.1] Fix delete_expired_data/nightly maintenance when many model snapshots… #57145
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… need deleting (elastic#57041) The queries performed by the expired data removers pull back entire documents when only a few fields are required. For ModelSnapshots in particular this is a problem as they contain quantiles which may be 100s of KB and the search size is set to 10,000. This change makes the search more efficient by only requesting the fields needed to work out which expired data should be deleted. # Conflicts: # x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/retention/ExpiredForecastsRemover.java # x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/retention/ExpiredModelSnapshotsRemover.java # x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/retention/MlDataRemover.java # x-pack/plugin/ml/src/test/java/org/elasticsearch/xpack/ml/job/retention/ExpiredModelSnapshotsRemoverTests.java
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Backport of #57041
The queries performed by the expired data removers pull back entire documents where only a few fields are required. For ModelSnapshots in particular this is a problem as they contain quantiles which may be 100s of KB and the search size is set to 10,000.
If the user is suffering with many accumulated snapshots that were not cleaned up due to #47103 the size of this search response could be very large. This change makes the search more efficient by only requesting the fields needed to work out which expired data should be deleted.