Resolve TransportErrors from ceda-fbs

[agstephens]

Resolve TransportErrors from ceda-fbs.

E.g.:

  File "/group_workspaces/jasmin/cedaproc/astephen/git/ceda-fbs/ceda-fbs/python/src/fbs/gui/scan_dataset.py", line 214, in <module>
    main()
  File "/group_workspaces/jasmin/cedaproc/astephen/git/ceda-fbs/ceda-fbs/python/src/fbs/gui/scan_dataset.py", line 207, in main
    read_dataset_from_file_and_scan(config, status)
  File "/group_workspaces/jasmin/cedaproc/astephen/git/ceda-fbs/ceda-fbs/python/src/fbs/gui/scan_dataset.py", line 124, in read_dataset_from_file_and_scan
    extract.read_dataset_from_file_and_scan()
  File "/group_workspaces/jasmin/cedaproc/astephen/git/ceda-fbs/ceda-fbs/python/src/fbs/processing/extract.py", line 463, in read_dataset_from_file_and_scan
    self.scan_files()
  File "/group_workspaces/jasmin/cedaproc/astephen/git/ceda-fbs/ceda-fbs/python/src/fbs/processing/extract.py", line 235, in scan_files
    raise TransportError(te)
elasticsearch.exceptions.TransportError

Simulate the problem and then fix it.

Note that the python docs say that you can send an ''ignore'' argument.

https://elasticsearch-py.readthedocs.io/en/master/api.html#ignore