Throws IndexNotFoundException in TransportGetAction for unknown System indices #61785
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The change #57936 introduced a dedicated thread pool for reads in system indices. It also introduced a potential NPE in the case the index to read in not yet present in the cluster state. Such a NPE surfaced recently in CI .
This pull request fixes that bug by using the
getIndexSafe()instead of justindex()method when retrieving the index's metadata so that an INFE is thrown if the index does not exist.