Graylog webUI hangs after updating csv-based lookup table file content

I haven't run it down to more specifics, but loading a fairly large(100MB) CSV seems to cause a hang of some sort. I would guess it is when the system notices the file has changed and attempts a reload?

## Current Behavior
Existing lookup table is a CSV on disk and is read into memory. Functioning properly.
Update the CSV, deploy it to cluster and attempt to load the lookup table management page- it hangs. It does not seem to recover unless I restart the graylog-server service.

## Possible Solution
Track down source of lookup table reload hang(I have not bothered trying to get more detail yet)

## Steps to Reproduce (for bugs)
1. Insert large CSV for data adapter
2. Update file in backend
3. Attempt to view the Lookup table UI

## Your Environment
* Graylog Version: 3.1.3