updated elasticsearch version in the pom
changed the QueryGenerators and add EntityMetaData to the ElasticSearchService in order to know which fields are Mref so that we could create nested query for those fields
Merge branch 'master' of https://github.com/molgenis/molgenis
Show message when no items are found for search in catalogue tree
updated the elasticsearch mapping and index in ElasticSearchService backend, now all the MREF are stored at nested type
Merge branch 'master' of https://github.com/molgenis/molgenis
Add DataService as a parameter to ElasticSearchService constructor and now it is required to initialize the ElasticSearchService instance
removed the commented code from IndexRequestGenerator.java
Merge pull request #1672 from ChaoPang/master

Introduced ElasticSearch nested type into index for MREF fields
Merge pull request #1671 from bartcharbon/master

Show message when no items are found for search in catalogue tree
Merge branch 'master' of github.com:molgenis/molgenis into feature/simplified_filter_UX_2649
reset xref filter code