Update administration.rst to add a section on search engine
configuration.
|image1207|
+.. _search-engine-configuration:
+
+Search engine configuration
+----------------------------
+Once you have switched to Elastic Search in your SearchEngine system preference,
+you’ll see a new link for Search engine configuration in the Catalog section of
+Administration. Here you will manage indexes, facets, and their mappings to MARC
+fields and subfields.
+
.. _acquisitions-module-label:
Acquisitions