To support transitions from one search engine to a different one, or
to a different installation of the same kind, this feature allows for
queries to use a different search engine from indexing. So you can
reindex (and do all other search operation) on one server, while
user queries are unaffected on a different server.
This feature supports changing between search engine types, and also
between two Solr installations.
Expand the Solr engine to use the built in (to Solr) Tika
file indexing engine. Files are shipped off for indexing with
curl. Each file must have it's own document. So grouping is
used to keep files and Moodle docs associated.
