Elasticsearch 7 support

[andriilahuta]

This depends on #115, although a few more changes are required, the most notable being the removal of mapping types.
To make things easier, perhaps it makes sense to mimic elasticsearch-dsl versioning scheme?

[andriilahuta]

@stylemistake, thanks, but I don't deserve the credit here. Most of the work was done in #136, which my fork is based on. I just removed the mapping types and added a few utility functions.

[safwanrahman]

Although it is still a work in progress, it works like a charm. If author is not going to provide any updates, I suggest y'all consider this fork as a new upstream.

As one of the contributor of this project and sole contributor of #136, which this fork is based on, I think your comment is disrespectful to the maintainer of this project. You should show empathy towards the maintainers who are giving their time for this project.

[stylemistake]

All I wanted to say is that until this is merged to master, there will be people who just look for a working library, and this branch is a good place to start because it contains all relevant merges and changes that make it all work.

I am by no means devaluing the work you've done here.

[safwanrahman]

Thanks for the issue @laevilgenius . I have started working on this in #176. Can you suggest some changes that you made in your fork?

[andriilahuta]

@safwanrahman, here's the diff. It's pretty straightforward: I removed mapping types and made code compatible with elasticsearch-dsl>=7.0.0. I also fixed an issue with tests not deleting test indices, although I'm still not sure it works every time.

Plus I added a couple of utility functions which I find quite useful, but I have already submitted them as PRs.

[CorrosiveKid]

@safwanrahman Great work on #115 👏🏽👏🏽. Are we close to getting #176 merged as well?