To support the differing needs for sophisticated, rich searching, Fedora 4 comes with a standard mechanism and integration point for indexing content in an external service. This could be a general search service such as Apache Solr or a standalone triplestore such as Fuseki or Blazegraph
To set up external index and searching you must:
The following search applications have been tested:
See the Solr Indexing Quick Guide to get quickly up and running with a Fedora 4 Solr integration.
The following github page has detailed instructions as to how to set up fcrepo-camel-toolbox. This standalone app listens to messages produced by fcrepo4 and invokes the search applications as configured: