A list of values for a parameter is obtained with a URL
such as &param=value1&param=value2
The returned dictionary will be:
{ param : [value1, value2]}

The httplib module has been renamed to http.client in Python 3.
So let's try to import HTTPConnection from both.

- Fix errors:
  - TypeError: 'float' object cannot be interpreted as an integer

- Fix deprecation warnings:
  - DeprecationWarning: Please use assertEqual instead
  - DeprecationWarning: Please use assertTrue instead

[dependency] pin python-elasticsearch and python-elasticsearch-dsl versions as elasticsearch 7 has been released

previously bool value was 0 or 1 it seems that elasticsearch 6 will not cast
this value anymore

this magic field does not exist anymore with elasticsearch 6 use computed field which it is named alltext by convention

this magic field does not exist anymore with elasticsearch 6
use computed field which it is named `alltext` by convention

[elasticserach] elasticsearch.client.Elasticsearch.index expect a string as value of `refresh` param

Starting from ES6, `_type` metadata is deprecated,
cf. https://www.elastic.co/guide/en/elasticsearch/reference/current/removal-of-types.html