Increase logging in IndexRecoveryIT#rerouteTest

This test started failing but the logging here is insufficient to
discern what is happening. This commit increases the logging level on
this test until the failure can be understood.

core/src/test/java/org/elasticsearch/indices/recovery/IndexRecoveryIT.java

@@ -240,6 +240,16 @@ public class IndexRecoveryIT extends ESIntegTestCase {
         validateIndexRecoveryState(nodeBRecoveryState.getIndex());
     }
 
+    @TestLogging(
+            "_root:DEBUG,"
+                    + "org.elasticsearch.action.bulk:TRACE,"
+                    + "org.elasticsearch.action.get:TRACE,"
+                    + "org.elasticsearch.cluster.service:TRACE,"
+                    + "org.elasticsearch.discovery:TRACE,"
+                    + "org.elasticsearch.indices.cluster:TRACE,"
+                    + "org.elasticsearch.indices.recovery:TRACE,"
+                    + "org.elasticsearch.index.seqno:TRACE,"
+                    + "org.elasticsearch.index.shard:TRACE")
     public void testRerouteRecovery() throws Exception {
         logger.info("--> start node A");
         final String nodeA = internalCluster().startNode();