Fixing the ElasticSearch Output plugin

[KeleranV]

Hello, I'm currently aiming to output data from Scrummage to ElasticSearch, you'll find below what I found:

• The function Elasticsearch_Main() calls Date() but with a wrong arg name (used Just_Date instead of Only_Date) [FIXED]
• The Scrummage instance cannot push the data to the index beceause the certificates of the elastic cluster is not truster (to be fixed by users -> add the elastic cert to scrummage server)
• The default index name in the GUI configuration for the output uses uppercase, which isn't allowed by elastic [TODO]
• Sending the request after all these fixes still throw an error : Common Library - request() missing 1 required positional argument: 'url'. [TODO]

For your information, my testing environment is a cluster of Docker containers, one for Scrummage and another for Elastic, both linked to the same virtual network.

Hope this will help 😄