reindex dates during git import

Codecov Report

Merging #285 into master will decrease coverage by <.01%. The diff coverage is 98.43%.

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
- Coverage   79.83%   79.82%   -0.01%     
==========================================
  Files         162      162              
  Lines        9788     9789       +1     
==========================================
  Hits         7814     7814              
- Misses       1974     1975       +1

Impacted Files	Coverage Δ
...index/documents/tests/commands/test_parse_dates.py	`100% <100%> (ø)`
arkindex/documents/tests/test_date_parser.py	`97.82% <100%> (-0.05%)`
arkindex/dataimport/filetypes.py	`92.47% <100%> (+0.25%)`
arkindex/documents/serializers/search.py	`100% <100%> (ø)`
arkindex/documents/tests/test_interpreted_date.py	`100% <100%> (ø)`
arkindex/documents/date_parser.py	`98.86% <98.07%> (-1.14%)`

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