Considerations - External Apache Solr index collections

When you create an index collection with the type Apache Solr, the resulting search index is stored in your Apache Solr infrastructure, not within the system instances.

Hitachi Content Intelligence supports external indexes running on Solr server versions 5 and 6.

These considerations apply to how the system interacts with external indexes in your Solr infrastructure:

• When you register an existing external Apache Solr index, the existing fields from that index are not automatically made visible to your users. To make them visible:
  1. In the query settings for the index collection, on the Fields tab, click Actions > Remove All Fields to remove the default fields.
  2. Click Actions > Add All Fields to add all existing fields from the index schema to the Fields tab.
• The 1.1 version of the Solr plugin sends SolrJ 5.5.3 requests (with JSON, when available). Solr calls that don't have explicit SolrJ support are implemented directly using the SolrJ HTTP clients.
• Your system uses the Solr commitWithin feature for indexing documents. This means that documents are quickly made available in searches, but are not guaranteed to be committed to disk. When a workflow task reaches an internal checkpoint, the systemsends a request to Solr to commit these documents to disk.

For information on creating index collections, see Adding index collections.

Parent Topic

• Index collections