Enter q as a Standard HTTP Query Parameter with the Query as a Value
Many APIs have special handling for the q query parameter according to different schemes, such as mongoDB query/SCIM/open search, and so on.
               
The REST Adapter treats 
               q as a standard HTTP query parameter and treats the query expression as a string value. For example:
                  - 
                        
https://host.example.com:7004/resource?q=AssetNumber=AP10001 - 
                        
GET /ccadmin/v1/products?q=orderLimit lt &maxLimit and startTime gt &startTime - 
                        
https://mysite.example.com/services/rest/connect/v1.3/queryResults?query=SELECT Contact from contract where contact.organization.name=&OrgName; 
According to standard HTTP, the query parameter in this case is q and the value is AssetNumber=AP1000.
               
Therefore, you are required to pass the query expression as a value to the query parameter with the name q.