Message Title

Issue Type:	Bug
Affects Versions:	5.6.0.Beta2
Assignee:	Gustavo Fernandes
Components:	elasticsearch, engine
Created:	30/Sep/2016 09:51 AM
Priority:	Major
Reporter:	Gustavo Fernandes

I'm porting the following code to take advantage of the Elasticsearch backend and the Lucene query translation:

 
                                                                  hSearchQuery = searchFactory.createHSQuery();
      hSearchQuery
         .luceneQuery(luceneQuery)
         .targetedEntities(Arrays.asList(classes));

The migrated version looks like:

 
                                                                ExtendedSearchIntegrator extendedIntegrator =
       searchFactory.unwrap(ExtendedSearchIntegrator.class);

hSearchQuery = searchFactory
      .createQueryDescriptor(luceneQuery, classes)
      .createHSQuery(extendedIntegrator);

This causes NPE when the index manager is not elasticsearch since the LuceneQueryDescriptor does not use the list of indexed classes:

 
                                                                java.lang.NullPointerException
	at org.hibernate.search.query.engine.impl.LuceneHSQuery.buildSearcher(LuceneHSQuery.java:401)
	at org.hibernate.search.query.engine.impl.LuceneHSQuery.buildSearcher(LuceneHSQuery.java:380)
	at org.hibernate.search.query.engine.impl.LuceneHSQuery.queryEntityInfos(LuceneHSQuery.java:138)

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