The Lucene-basded HQL parser component uses the internal method {{TypeMetadata#getEmbeddedTypeMetadata()}} atm. In the long run this needs to be altered to make use the public meta-data API instead, but for now it causes a compatability issue, as this method's signature has changed from 5.2 to 5.3 (returns a set now instead of a list).
In order to make the parser component work with 5.2 and 5.3, let's revert that change for now and re-do it once HSEARCH-1865 is implemented.
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