[CI] Auto commit changes from spotless

Author: elasticsearchmachine

server/src/main/java/org/elasticsearch/action/admin/cluster/allocation/ClusterAllocationExplainRequest.java

@@ -20,7 +20,6 @@
 import org.elasticsearch.xcontent.XContentParser;
 
 import java.io.IOException;
-import java.util.Set;
 
 import static org.elasticsearch.action.ValidateActions.addValidationError;