search: fix filtered output format

* Addresses issue with research and export that not accept the "ot"
  filter argument. (closes #2292)

Signed-off-by: Leonardo Rossi <leonardo.r@cern.ch>
101:41: E126 continuation line over-indented for hanging indent
113:37: E126 continuation line over-indented for hanging indent
299: D103 Docstring missing