How to query for Deals record based on Pipeline?

How to query for Deals record based on Pipeline?

I want to query for Deals records that matches a specified Pipeline using a Deluge function. When I call zoho.crm.searchRecords("Deals","(Pipeline:equals:" + myPipeline + ")"), I get this error:

{ code: 'INVALID_QUERY' , details: {...} , message: 'Invalid query formed' , status: 'error' }
code:INVALID_QUERY
details:
Object
reason:the field is not available for search
api_name:Pipeline
message:Invalid query formed
status:

How do I solve this?