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Search filters offer a way to control user access to documents in the index. This may be required for document security purposes or to allow the user to search within a specific data set. This functionality uses Solr's [filter query|http://wiki.apache.org/solr/CommonQueryParameters#fq] capability, where a predefined search is added to the end of the user's query without the user entering it themselves.
In order for content to be filtered based on who the user is or what group they belong to, the criteria used for filtering must exist on each document prior to indexing. This may require some preprocessing of each document to make sure it contains the data to be used in filtering. For more information, see [Securing Access to Content|lweug18:Securing LucidWorks Enterprise#Restricting Access to Content].
If using LDAP for user authentication, LDAP-defined usernames and/or groups can be mapped to a filter. This filter would then be applied when the user logs in the LucidWorks Enterprise.