We're implementing a push2 collection but find the query_phrase operator and cgi parameter are not working to return results. It does work in other collection types we use, like web. Our version is 15.18.0. For example if we surround our query in double quotes, i.e. "search for this exact phrase" or use the URL cgi parameter: query_phrase=search for this exact phrase - nothing is returned - when the collection has documents that contain "search for this exact phrase" - any idea how we can fix this?