sort by "termfreq" Solr function doesn't work

Question

Hi, in our case we have to show first the items, where the field "memberlist" contains the current user id. In Solr it is possible to sort by the function " numFound(fieldName, fieldValue)" : 
 the function returns the number of matches in a single field. 
 Unfortunatelly, this query in solr and it doesn't work in Telligent. The exception is: "We apologize, but an unknown error has occurred during search. Please try your search again." Do you know how to fix it or do you have some workaround for such case?

Kevin Cunningham · Answer

The properties for filters and sorting are indended for simple "fieldname:value(s) (filters) and "fieldname asc/desc, [optional] another field asc/desc" usage from the API. This is intentional to ensure a supportable API and security. When it comes to more advanced, Solr specific functions the current recommendation is to 1) use a unique place holder in the field that matches the expected format (ex. termfreqUser:someValue) and 2) pickup/intercept this format using the Solr specific search events to manipulate the query before being sent. This can be done using an automation - see this event and reference the SolrOptions.Url.

sort by "termfreq" Solr function doesn't work

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