Bugfix 1308

[etiennedi]

• Introduces an in memory deleted doc id tracker
• the tracker is not yet refilled at startup, that should happen as part of Clean up deleted doc ids from inverted indices periodically #1285
• closes Bug: valueBoolean==false returns no results #1308

[codecov]

Codecov Report

Merging #1309 (94275ed) into master (bcdce1a) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1309      +/-   ##
==========================================
+ Coverage   73.73%   73.77%   +0.04%     
==========================================
  Files         212      213       +1     
  Lines       21303    21338      +35     
==========================================
+ Hits        15707    15742      +35     
+ Misses       4341     4337       -4     
- Partials     1255     1259       +4     

Flag	Coverage Δ
integration	68.37% <100.00%> (+0.15%)	⬆️
unittests	73.77% <100.00%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
adapters/repos/db/aggregator/aggregator.go	75.75% <100.00%> (+1.56%)	⬆️
adapters/repos/db/aggregator/filtered.go	78.21% <100.00%> (ø)
adapters/repos/db/aggregator/grouper.go	77.50% <100.00%> (ø)
adapters/repos/db/docid/deleted_tracker.go	100.00% <100.00%> (ø)
adapters/repos/db/inverted/searcher.go	77.72% <100.00%> (+1.69%)	⬆️
adapters/repos/db/shard.go	55.84% <100.00%> (+0.58%)	⬆️
adapters/repos/db/shard_aggregate.go	100.00% <100.00%> (ø)
adapters/repos/db/shard_read.go	63.77% <100.00%> (+0.57%)	⬆️
adapters/repos/db/shard_write_delete.go	41.17% <100.00%> (+1.78%)	⬆️
adapters/repos/db/shard_write_put.go	59.09% <100.00%> (+0.47%)	⬆️
... and 5 more

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