@Override
protected ShardUpgradeResult shardOperation(UpgradeRequest request, ShardRouting shardRouting) {
IndexShard indexShard =
indicesService
.indexServiceSafe(shardRouting.shardId().getIndex())
.shardSafe(shardRouting.shardId().id());
org.apache.lucene.util.Version oldestLuceneSegment = indexShard.upgrade(request);
// We are using the current version of Elasticsearch as upgrade version since we update mapping
// to match the current version
return new ShardUpgradeResult(
shardRouting.shardId(),
indexShard.routingEntry().primary(),
Version.CURRENT,
oldestLuceneSegment);
}
