Merge branch 'feat/implement-elasticsearch-6-and-7' of https://github.com/weseek/growi into imprv/7639-elasticsearch-reindex-on-boot
* 'feat/implement-elasticsearch-6-and-7' of https://github.com/weseek/growi:
- Fix yarn.lock based on Head master that pulled before
LuqmanHakim-Grune