CXXCBC-145: Search query request raw option not used (#380)

Co-authored-by: Jake Rawsthorne <jake.rawsthorne@couchbase.com>

Author: avsej

core/operations/document_search.cxx

@@ -97,6 +97,10 @@ search_request::encode_to(search_request::encoded_request_type& encoded, http_co
         body["collections"] = collections;
     }
 
+    for (const auto& [key, value] : raw) {
+        body[key] = utils::json::parse(value);
+    }
+
     encoded.type = type;
     encoded.headers["content-type"] = "application/json";
     encoded.method = "POST";