{"action":"created","comment":{"url":"https://api.github.com/repos/elastic/elasticsearch/pulls/comments/42505803","id":42505803,"diff_hunk":"@@ -827,29 +827,14 @@ private void sendFailShard(ShardRouting shardRouting, String indexUUID, String m\n         }\n     }\n \n-    private class FailedEngineHandler implements Engine.FailedEngineListener {\n+    private class FailedEngineHandler implements Callback<IndexShard.ShardFailure> {\n         @Override\n-        public void onFailedEngine(final ShardId shardId, final String reason, final @Nullable Throwable failure) {\n-            ShardRouting shardRouting = null;\n-            final IndexService indexService = indicesService.indexService(shardId.index().name());\n-            if (indexService != null) {\n-                IndexShard indexShard = indexService.getShardOrNull(shardId.id());\n-                if (indexShard != null) {\n-                    shardRouting = indexShard.routingEntry();\n-                }\n-            }\n-            if (shardRouting == null) {\n-                logger.warn(\"[{}][{}] engine failed, but can't find index shard. failure reason: [{}]\", failure,\n-                        shardId.index().name(), shardId.id(), reason);\n-                return;\n-            }\n-            final ShardRouting fShardRouting = shardRouting;\n-            threadPool.generic().execute(new Runnable() {\n-                @Override\n-                public void run() {\n-                    synchronized (mutex) {\n-                        failAndRemoveShard(fShardRouting, indexService, true, \"engine failure, reason [\" + reason + \"]\", failure);\n-                    }\n+        public void handle(final IndexShard.ShardFailure shardFailure) {\n+            final IndexService indexService = indicesService.indexService(shardFailure.routing.shardId().index().name());\n+            final ShardRouting shardRouting = shardFailure.routing;\n+            threadPool.generic().execute(() -> {\n+                synchronized (mutex) {\n+                    failAndRemoveShard(shardRouting, indexService, true, \"engine failure, reason [\" + shardFailure.reason + \"]\", shardFailure.cause);","path":"core/src/main/java/org/elasticsearch/indices/cluster/IndicesClusterStateService.java","position":54,"original_position":54,"commit_id":"b772b513e004369f7c2c7fedea9b8715088e029c","original_commit_id":"b772b513e004369f7c2c7fedea9b8715088e029c","user":{"login":"bleskes","id":1006375,"avatar_url":"https://avatars.githubusercontent.com/u/1006375?v=3","gravatar_id":"","url":"https://api.github.com/users/bleskes","html_url":"https://github.com/bleskes","followers_url":"https://api.github.com/users/bleskes/followers","following_url":"https://api.github.com/users/bleskes/following{/other_user}","gists_url":"https://api.github.com/users/bleskes/gists{/gist_id}","starred_url":"https://api.github.com/users/bleskes/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bleskes/subscriptions","organizations_url":"https://api.github.com/users/bleskes/orgs","repos_url":"https://api.github.com/users/bleskes/repos","events_url":"https://api.github.com/users/bleskes/events{/privacy}","received_events_url":"https://api.github.com/users/bleskes/received_events","type":"User","site_admin":false},"body":"`engine 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This commit refactors the infrastrucutre to use\r\nuse already existing interfaces to communicate if a shard has failed and\r\nprevents engine private classes to be implemented on a higher level.\r\nThis change is purely 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