Snapshot Finalization Throws NPE in 7.5 #50200
Description
We're seeing the following NPE in Cloud logs:
Caused by: java.lang.NullPointerException
at org.elasticsearch.repositories.blobstore.ChecksumBlobStoreFormat.write(ChecksumBlobStoreFormat.java:226) ~[elasticsearch-7.5.0.jar:7.5.0]
at org.elasticsearch.repositories.blobstore.ChecksumBlobStoreFormat.writeTo(ChecksumBlobStoreFormat.java:197) ~[elasticsearch-7.5.0.jar:7.5.0]
at org.elasticsearch.repositories.blobstore.ChecksumBlobStoreFormat.write(ChecksumBlobStoreFormat.java:185) ~[elasticsearch-7.5.0.jar:7.5.0]
at org.elasticsearch.repositories.blobstore.BlobStoreRepository.lambda$finalizeSnapshot$26(BlobStoreRepository.java:738) ~[elasticsearch-7.5.0.jar:7.5.0]
at org.elasticsearch.action.ActionRunnable$1.doRun(ActionRunnable.java:45) ~[elasticsearch-7.5.0.jar:7.5.0]
... 5 more
during snapshot finalization. This seems like a bug where the cluster metadata does not contain an index for a name that was just snapshot (the deeper cause is that clusterMetaData.index(index.getName()) in BlobStoreRepository returns null). I'm investigating this.
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