Elastictools

- Fix multiple doc_type in mapping

- Fix multiple error related to doc_type in ES7
- Update elasticsearch-py to 7.0.2
- Fix bug related to doctype while indexing document in ES 7

- Update elasticsearch-py to 7.0.2
- Fix bug related to doctype while indexing document in ES 7

Added
- `DocTools.dump()`
- `DocTools.bulk_insert_from_json()`

Added
- `DocTools.bulk()`
- `DocTools.bulk_insert_from_csv()`
- `IndexTools.create_if_not_exists()`
- `IndexTools.truncate()`

Added
- `HISTORY.md`
- `long_description` in setup.py that contains content of `README.md` and `HISTORY.md`

Changed
- `N/A`

Removed
- `N/A`