Small fix to make sure searchable_fields are updated

[jmmshn]

Various fixes

• newer_in function in S3Store should only look in the the index store of the target
• searchable_fields must be included in the search_keys in the multiprocessing verion of the update function
• typos in docs

[codecov]

Codecov Report

Merging #303 into master will decrease coverage by 0.46%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #303      +/-   ##
==========================================
- Coverage   88.49%   88.02%   -0.47%     
==========================================
  Files          28       28              
  Lines        2121     2130       +9     
==========================================
- Hits         1877     1875       -2     
- Misses        244      255      +11     

Impacted Files	Coverage Δ
src/maggma/stores/aws.py	84.61% <100.00%> (+2.11%)	⬆️
src/maggma/stores/mongolike.py	87.25% <0.00%> (-6.38%)	⬇️

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[jmmshn]

@munrojm this should fix the speed issues and make the CopyBuilder usable.

[shyamd]

One suggested change.