Elasticsearch 1.4.2

I tried to update to 1.4.2 (based on your 1.4.0 branch).

I now have 8 failing tests:
7 with this message : 
```
Failed asserting that exception of type "Elastica\Exception\ResponseException" matches expected exception "\Elastica\Exception\RuntimeException". Message was: "ClusterBlockException[blocked by: [FORBIDDEN/5/index read-only (api)];]" 
```

The last one is that ```Thread.sleep(100); ``` is [not authorized anymore now by ES](https://github.com/elasticsearch/elasticsearch/blob/master/src/test/java/org/elasticsearch/script/GroovySandboxScriptTests.java#L82)