Add support for es7 in version 5

[alexander-schranz]

This change would allow to install the ES7 client and use it with the same api. It would help us that the community can use the newest ES version when using the SuluArticleBundle. Upgrading to the newest version of the bundle would be in our case to many bc breaks at current state.

The change itself is simple if its uses Elasticsearch 7 the Index settings is set to:

include_type_name=true

[fredericbarthelet]

@alexander-schranz just noticed that I had to require ocramius/package-version in my project in order to ensure this package can retrieve elasticsearch-dsl version. Shouldn't this package be required in this project instead ?

[alexander-schranz]

@fredericbarthelet don't wanted to break someones project by adding a additional package, but if @saimaz is ok for it we could add ocramius/package-versions:^1.0 as requirement.

[alexander-schranz]

@fredericbarthelet we decided to add Symfony 5 support to the v5 version to fork this bundle. There the requirement for the ocramius/package-version is removed and is instead build on top of a VERSION constant by added php elasticsearch library.

The fork can be found here: https://github.com/handcraftedinthealps/elasticsearchbundle