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The discovery.xml file is located in the [dspace]/config/spring/api directory.  Modifying these settings can change the behavior of the Search pages in the user interface, allowing you to customize the facets, filters, sort options, etc.

If you add new search fields, sorts, etc. then you should coordinate changes here with the message catalog(s) in the UI.  You will need to add e.g. search.filters.filter.NAME.head (where NAME is the indexFieldName of the field definition) to label a new search field.

Structure Summary

This file is in XML format.  You should be familiar with XML before editing this file. The configurations are organized together in beans, depending on the purpose these properties are used for.
This purpose can be derived from the class of the beans. Here's a short summary of classes you will encounter throughout the file and what the corresponding properties in the bean are used for.

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