Github user apiri commented on the pull request:

    https://github.com/apache/nifi/pull/255#issuecomment-213661619
  
    Hey @joaohf!  Looks like @mattyb149 has already started giving some input 
but saw that there are a few test failures concerning expression language such 
as the one below (full sample log is available at: 
https://s3.amazonaws.com/archive.travis-ci.org/jobs/114414795/log.txt).  
Haven't dug deep into the tests but wanted to call it out to your attention to 
get a fix for later incorporation.
    
    Thanks!
    
    ```
    
testPutElasticSearchOnTrigger(org.apache.nifi.processors.elasticsearch.TestPutElasticsearch)
  Time elapsed: 0.01 sec  <<< FAILURE!
    java.lang.AssertionError: java.lang.IllegalStateException: Attempting to 
retrieve value of PropertyDescriptor[Index Operation] without first evaluating 
Expressions, even though the PropertyDescriptor indicates that the Expression 
Language is Supported. If you realize that this is the case and do not want 
this error to occur, it can be disabled by calling 
TestRunner.setValidateExpressionUsage(false)
    ```


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