From a783d342d2d82ce45b0b136166d20c44495277cb Mon Sep 17 00:00:00 2001
From: Michael McCandless <mail@mikemccandless.com>
Date: Tue, 11 Nov 2014 10:49:26 -0500
Subject: [PATCH] Test: dump all threads when delete index fails during test
 cleanup

---
 src/test/java/org/elasticsearch/test/TestCluster.java | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/test/java/org/elasticsearch/test/TestCluster.java b/src/test/java/org/elasticsearch/test/TestCluster.java
index 1e46be50520..18b0f825d84 100644
--- a/src/test/java/org/elasticsearch/test/TestCluster.java
+++ b/src/test/java/org/elasticsearch/test/TestCluster.java
@@ -151,6 +151,12 @@ public abstract class TestCluster implements Iterable<Client>, Closeable {
                         assertAcked(client().admin().indices().prepareDelete(concreteIndices.toArray(String.class)));
                     }
                 }
+            } catch (AssertionError ae) {
+                // Try to see what threads are doing when we hit the "Delete index failed - not acked":
+                logger.info("dump all threads on AssertionError");
+                ElasticsearchTestCase.printStackDump(logger);
+                logger.info("done dump all threads on AssertionError");
+                throw ae;
             }
         }
     }