4d51ede8_rks_Search_UI_2_9___Lucidworks__Description
[Parameter] Indexed [Fields API Attribute Name] indexed [Description] 
An indexed field is searchable on the words (or exact value) as determined by the field type. Unindexed fields are useful to provide the search client with metadata for display. For example, URL may not be a valuable search term, but it is very valuable information to show users in their results list. For performance reasons, a best practice is to index as few fields as necessary to still give users a satisfactory search experience. If you change this setting, you must reindex all documents.
Field Configuration - LucidWorks Search UI 2.9 - Lucidworks
Description