Individuals connectors might have specific fields here that were not general enough to be in Search Configuration
Additionally, this is where you can use the “Add Custom Parameter” button to set any default query values for the connection.
A query_fq configuration param lets you define facet queries behind the scene. This is done to provide limited views or subsets of data in the search. Essentially you could create any number of views on the same date but each view would display different results. This can also be used in a role base system where you have views setup for specific user roles.Unless the fq is already encoded, you will need to wrap it in the encode() function where it will be URLEncoded UTF-8.
The syntax is:
query_fq for the first one query_fq1 for the second etc.