Fix getTermCountsWithAnalyzer when term has a colon in it

[lintool]

Previous use of parser means that a term with a colon is interpreted as a field. See castorini/pyserini#81

[codecov]

Codecov Report

Merging #1135 into master will increase coverage by 0.20%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1135      +/-   ##
============================================
+ Coverage     47.54%   47.75%   +0.20%     
- Complexity      699      706       +7     
============================================
  Files           143      143              
  Lines          8280     8278       -2     
  Branches       1180     1180              
============================================
+ Hits           3937     3953      +16     
+ Misses         4006     3988      -18     
  Partials        337      337              

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/anserini/index/IndexReaderUtils.java	45.35% <100.00%> (-0.60%)	21.00 <2.00> (ø)
...anserini/ltr/feature/base/PMIFeatureExtractor.java	86.53% <0.00%> (+1.92%)	13.00% <0.00%> (+1.00%)
...java/io/anserini/ltr/feature/CountBigramPairs.java	87.01% <0.00%> (+22.07%)	29.00% <0.00%> (+6.00%)

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[PepijnBoers]

Commit solves my issue in Pyserini.