[TEST] Add more logging to allocation decision

src/test/java/org/elasticsearch/cluster/MinimumMasterNodesTests.java

@@ -31,6 +31,7 @@ import org.elasticsearch.discovery.zen.elect.ElectMasterService;
 import org.elasticsearch.index.query.QueryBuilders;
 import org.elasticsearch.test.ElasticsearchIntegrationTest;
 import org.elasticsearch.test.ElasticsearchIntegrationTest.ClusterScope;
+import org.elasticsearch.test.junit.annotations.TestLogging;
 import org.junit.Test;
 
 import java.util.concurrent.ExecutionException;
@@ -163,6 +164,7 @@ public class MinimumMasterNodesTests extends ElasticsearchIntegrationTest {
     }
 
     @Test @Slow
+    @TestLogging("cluster.routing.allocation.allocator:TRACE")
     public void multipleNodesShutdownNonMasterNodes() throws Exception {
         Settings settings = settingsBuilder()
                 .put("discovery.type", "zen")