[Feature] add precise search type for Elastic Search

[jnlin]

Added a query parameter t=match on /explore/code and /repo/search, which add precise search feature for code search with Elastic Search.

[lafriks]

Sorry could not decide about version 😆

[codecov-commenter]

Codecov Report

Merging #12869 into master will decrease coverage by 0.00%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master   #12869      +/-   ##
==========================================
- Coverage   42.60%   42.59%   -0.01%     
==========================================
  Files         671      671              
  Lines       73625    73644      +19     
==========================================
+ Hits        31366    31369       +3     
- Misses      37179    37192      +13     
- Partials     5080     5083       +3     

Impacted Files	Coverage Δ
modules/indexer/code/elastic_search.go	1.73% <0.00%> (-0.03%)	⬇️
modules/indexer/code/indexer.go	35.95% <ø> (ø)
routers/home.go	46.96% <0.00%> (-0.54%)	⬇️
modules/indexer/code/bleve.go	70.08% <68.75%> (-1.08%)	⬇️
modules/context/pagination.go	100.00% <100.00%> (ø)
modules/indexer/code/search.go	83.09% <100.00%> (ø)
modules/indexer/code/wrapped.go	48.88% <100.00%> (ø)
routers/repo/search.go	73.33% <100.00%> (+2.96%)	⬆️
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
modules/indexer/stats/db.go	60.86% <0.00%> (-8.70%)	⬇️
... and 5 more

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[jnlin]

@lafriks committed, thanks!

[lafriks]

Could you add this functionality also for blevesearch as imho it should support it

[jolheiser]

This also needs some documentation somewhere, as otherwise there's no way to actually use it without knowing the magic query parameter.

[jnlin]

This also needs some documentation somewhere, as otherwise there's no way to actually use it without knowing the magic query parameter.

Added a dropdown in e94a59b for this

[jnlin]

Could you add this functionality also for blevesearch as imho it should support it

I am not familiar with bleve, need more time to do some research

[jnlin]

I am not familiar with bleve, need more time to do some research

ready for review

[jnlin]

ready for review

[lafriks]

LGTM, just small spacing nit

[lunny]

Please resolve the conflicts.

[jnlin]

ready for review

[codecov-io]

Codecov Report

Merging #12869 (49812fb) into master (b2c20b6) will increase coverage by 0.00%.
The diff coverage is 57.14%.

@@           Coverage Diff           @@
##           master   #12869   +/-   ##
=======================================
  Coverage   42.11%   42.11%           
=======================================
  Files         758      758           
  Lines       81085    81104   +19     
=======================================
+ Hits        34148    34157    +9     
- Misses      41360    41369    +9     
- Partials     5577     5578    +1     

Impacted Files	Coverage Δ
modules/indexer/code/elastic_search.go	1.73% <0.00%> (-0.03%)	⬇️
modules/indexer/code/indexer.go	35.95% <ø> (ø)
routers/home.go	48.10% <0.00%> (-0.56%)	⬇️
modules/indexer/code/bleve.go	70.08% <68.75%> (-1.08%)	⬇️
modules/context/pagination.go	85.71% <100.00%> (+0.71%)	⬆️
modules/indexer/code/search.go	83.09% <100.00%> (ø)
modules/indexer/code/wrapped.go	48.88% <100.00%> (ø)
routers/repo/search.go	73.33% <100.00%> (+2.96%)	⬆️
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
modules/process/manager.go	72.50% <0.00%> (-2.50%)	⬇️
... and 4 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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