[ML] Wait for all shards to be active when creating the ML stats index #108202
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davidkyle
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Several tests have started failing recently with the dread
no_shard_available_action_exceptionwhen querying the.ml-statsindex. The error occurs when an index is accessed directly after creation before any shards have become active. See #65846 for more details.The recent failures stem from the change to invalidate the model cache in #106988. The cache is invalidated on PUT model which causes the models to be evicted and on eviction they persists stats to the
.ml-statsindex. The failing tests create a model causing the cache eviction and triggering a write to.ml-stats, immediately after the test clean up kicks in and during the model deletion the.ml-statsindex is queried throwing theno_shard_available_action_exception.The first part to wait for all shard to become active when creating the index but that isn't sufficient in itself as the writes to
.ml-statsare async. Creating or deleting a model kicks off the write but it may not have completed so the post test clean up needs to wait for the.ml-statsto initialise.Closes #106652
Closes #107815
Closes #107777
Closes #107505
Closes #80703