You have created a custom filter definition for DCS agent Description field in DCS console, but after applying the filter the query does not return any result.
DCS 6.10
DCS 6.10.1
This is a known issue in DCS version 6.10 and 6.10.1
Upgrade DCS Management Server to version 6.10.2 or newer.
After the upgrade you can successfully use a custom filter for the description field and it will return expected results.