testAbortedSnapshotDuringInitDoesNotStart fails with ClassCastException

[dnhatn]

This test is failing with ClassCastException.

  1> org.elasticsearch.transport.RemoteTransportException: [node_sd3][127.0.0.1:34425][internal:cluster/snapshot/update_snapshot_status]
  1> Caused by: org.elasticsearch.transport.ResponseHandlerFailureTransportException: java.lang.ClassCastException: org.elasticsearch.snapshots.SnapshotShardsService$UpdateIndexShardSnapshotStatusResponse cannot be cast to org.elasticsearch.transport.TransportResponse$Empty
  1> Caused by: java.lang.ClassCastException: org.elasticsearch.snapshots.SnapshotShardsService$UpdateIndexShardSnapshotStatusResponse cannot be cast to org.elasticsearch.transport.TransportResponse$Empty
  1> 	at org.elasticsearch.snapshots.SnapshotShardsServic

I can't reproduce this locally but this test failed 4 times today.

 ./gradlew :server:integTest \
  -Dtests.seed=F8B30D4F31180D3F \
  -Dtests.class=org.elasticsearch.snapshots.SharedClusterSnapshotRestoreIT \
  -Dtests.method="testAbortedSnapshotDuringInitDoesNotStart" \
  -Dtests.security.manager=true \
  -Dtests.locale=cs \
  -Dtests.timezone=AET \
  -Dcompiler.java=11 \
  -Druntime.java=8

CI:

• https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+intake/1768/console
• https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+intake/1763/console
• https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+multijob-unix-compatibility/os=amazon/217/console
• https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+internalClusterTest/262/console
• https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+default-distro-bwc-tests/326/consoleText

[elasticmachine]

Pinging @elastic/es-distributed

[original-brownbear]

Nasty ... I'll be able to get to this tomorrow afternoon. Should be an easy fix though.