Remove mapping type from search fields.

[jfcantu]

Removes mapping type as a search parameter when querying alert logs.

Mapping types were removed in ElasticSearch 7.x, and attempting to search by mapping type will prevent results from being returned.

[nsano-rururu]

We have confirmed that applying this solution also solves the problem. Thank you for your support. I hope that it will be incorporated into the main body as soon as possible.

[johnsusek]

@jfcantu The new repo going forwarding for praeco will be https://github.com/johnsusek/elastalert-server. Can you please put this PR into that fork? I could make this change but I would prefer you get credit.

[johnsusek]

Also, will this still work with ES5/6 ? Maybe there should be a version check around this logic

[jfcantu]

@johnsusek Will do! Before I do, I'll review my code and check the compatibility.

[johnsusek]

Ended up getting this change into https://github.com/johnsusek/elastalert-server today, which praeco master now points to. A new release for praeco is coming shortly with these changes, thanks. I no longer have permissions to close PRs in this repo, so you can close this. I'll mention you in the praeco readme.

[joshbasho]

@jfcantu any chance you could put your docker image up as a repo?

There's a bug in Praeco's elastalert-server. The workaround is to use this elastalert-server image, which is based on jfcantu/elastalert. Would like to bump the Elastalert version in it up and see if I can figure out what's different so it can be integrated into praeco image.