Support passing an explicit index_name for search indexing

[ericholscher]

This is a bit of a hack, but it will work for now.

[safwanrahman]

I think we can move to the previous approach where we could pass the index_name in the update method by overriding the default DocType class of django-elasticsearch-dsl

[ericholscher]

Yea, that just leads to a lot of code that we're copy/pasting into our project, which feels more brittle.

[humitos]

I don't find the hack too hacky. Doesn't look to bad, actually.

[safwanrahman]

It will provide the wrong index name to the tasks that are running during the doc_obj.update(queryset.iterator()). I think its better to avoide the hacky way if we can do from our end.

Yea, that just leads to a lot of code that we're copy/pasting into our project, which feels more brittle.

I am hoping to implement it to the django-elasticsearch-dsl package as well. I think that time we do not need this much of code. But till then, I think its good to have that code in our project.

[ericholscher]

It will provide the wrong index name to the tasks that are running during the doc_obj.update(queryset.iterator()). I think its better to avoide the hacky way if we can do from our end.

I tested it and it seems to work fine.

[ericholscher]

Going to merge this so we can ship it, but we should come back to this.