Delete unusesd import

Author: drempapis

server/src/test/java/org/elasticsearch/common/util/concurrent/TaskExecutionTimeTrackingPerIndexEsThreadPoolExecutorTests.java

@@ -12,7 +12,6 @@
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.test.ESTestCase;
 
-import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 
 import static org.elasticsearch.common.util.concurrent.EsExecutors.TaskTrackingConfig.DEFAULT_EWMA_ALPHA;