DATASOLR-67 - add missing return
DATASOLR-67 - replace embedded solr server by mock

check if commit/rollback called on mock to verify transaction support
instead of using an embedded server as there have been issues with
the Transaction log on one CI node
DATASOLR-60 - Support highlighting via SolrTemplate

execute a HighlightQuery against solr. use id of entity to link
highlights to it and return a HighlightPage containing both, highlights
and query content.

Next will be to add repository support for highlighting via
@Highlight annotation.