Handle index deletion while querying in ES|QL (#137702) #138615
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…astic#138539) If a sub-block of an aggregate_metric_double block is a ConstantNullBlock, serialization fails because DoubleBlock.readFrom or IntBlock.readFrom are not compatible with ConstantNullBlock.writeTo.
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If the index is deleted while querying, ES|QL might try to get the index routing from the latest cluster state. This could throw an index-not-found exception, which is not handled properly, causing the user to never receive a response, even though execution has completed. This also results in a dangling task in the task manager.
Relates #126653
Closes #135863
(cherry picked from commit 0051df8)