Lunny Xiao 477ef46251 Add more tests and docs for issue indexer, add db indexer type for searching from database (#6144)
* add more tests and docs for issue indexer, add db indexer type for searching from database

* fix typo

* fix typo

* fix lint

* improve docs
2019-02-21 13:01:28 +08:00
..
2019-02-19 18:09:47 -05:00