CC-1096 Added ES error message when unable to create an index

Author: rhauch

src/main/java/io/confluent/connect/elasticsearch/ElasticsearchWriter.java

@@ -247,7 +247,8 @@ public void createIndicesForTopics(Set<String> assignedTopics) {
         try {
           JestResult result = client.execute(createIndex);
           if (!result.isSucceeded()) {
-            throw new ConnectException("Could not create index:" + index);
+            String msg = result.getErrorMessage() != null ? ": " + result.getErrorMessage() : "";
+            throw new ConnectException("Could not create index '" + index + "'" + msg);
           }
         } catch (IOException e) {
           throw new ConnectException(e);