system/how-to/Indexing-Metadata-in-Hyrax.md

+Reference: 
+
+Solr: https://solr.apache.org/guide/6_6/index.html
+
+[Solr schema](https://gitlab.ruhr-uni-bochum.de/FDM/rdm-system/rdms/-/blob/master/hyrax/solr/conf/schema.xml#L179-331) with the dynamic field definitions (based on prefixes).
+
+## Connecting the schema dynamic field prefixes to field descriptors in Hyrax
+
+The default indexing descriptors used in Hyrax is defined in the link below
+
+https://github.com/samvera/active_fedora/blob/511ee837cd9a461021e53d5e20f362b634de39a8/lib/active_fedora/indexing/default_descriptors.rb
+
+A few additional descriptors in  the [basic metadata indexer](https://github.com/samvera/hyrax/blob/b034218b89dde7df534e32d1e5ade9161e129a1d/app/indexers/hyrax/basic_metadata_indexer.rb)
+
+
+We use this knowledge to decide on how we want the value for a property to be treated in Solr
+
+* Search on it (index in solr terms, searchable in hyrax desacriptor)
+* Retrieve the  value as it was added (Stored)
+* Need to be able to facet on it (group search results by this category, example. keyword, creator) (facetable)
+* Need to be able to do date range queries - dateable
+