atlas: fix race condition for QueryIndex #1148
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Updates can happen concurrently with reads. This can result in some of the volatile variables being set to `null` after the `null` check occurs. Now they will get copied to a local reference before being used for reads.
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Updates can happen concurrently with reads. This can result in some of the volatile variables being set to
nullafter thenullcheck occurs. Now they will get copied to a local reference before being used for reads.