WIP: add elastic search for searching source
refactor: get sources by keyword api
chore: pagination with elasticsearch in get sources by keyword api
chore: sources of contribution migrate to elasticsearch
chore: sources are sorted by createdAt field in mongo and elasticsearch
chore: use elasticsearch in character.js
fix: should return perPage and total field
chore: migrate to elasticsearch for quotes
chore: remove useless pagination code
fix: should return empty array when no result
Merge pull request #8 from scarletsky/elasticsearch

Elasticsearch