We're cleaning up our JIRA custom fields (in JIRA 7, on our own server). Part of this is copying values from two separate fields into one amalgamated field of the same type. We need to move values from the old field(s) into the new, and I'm trying to use the script runner "Copy custom field values" built-in script. But every time I try to do so, it returns a timeout error: "Error timeout: No Stack Trace available". The preview says there it identifies 1969 issues, and that doesn't seem exorbitant.