Index "primaryHierarchy" attribute in Elasticsearch

When a new node events is received, the payload contains an attribute called "primaryHierarchy" which is the primary hierarchy of ancestors of the resource.

In order to enable SITE and PATH queries we need to index this multivalued attribute, which is ignored at time of writing.

Acceptance Criteria

• The Elasticsearch connector, specifically the MetadataIndexer, includes, as part of the Document that will be indexed, the "primaryHierarchy" multivalued attribute

• Unit tests