If reindex data streams fails on one index, try the next (#122294) (#122312)

Author: masseyke

x-pack/plugin/migrate/src/main/java/org/elasticsearch/xpack/migrate/task/ReindexDataStreamPersistentTaskExecutor.java

@@ -225,6 +225,7 @@ private void maybeProcessNextIndex(
             }, e -> {
                 reindexDataStreamTask.reindexFailed(index.getName(), e);
                 listener.onResponse(null);
+                maybeProcessNextIndex(indicesRemaining, reindexDataStreamTask, sourceDataStream, listener, parentTaskId);
             }));
     }