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.