I've read the following link Breaking changes in 6.0 about the disappearing _all field, but I was searching for more information about this.
Why are you guys doing this? Is there documentation so we can understand the motives behind this move?
How should I exclude fields from the query_string and simple_query_string queries?
If these queries are searching over all the fields, how do they cope with the different analyzers that I use in those fields. What about multi-fields?
I can of course test all this, but I want to know the reasons and the direction you are evolving into to be able to better use this great piece of software!