[TEST] improved regular scroll REST test
[TEST] improved regular scroll REST test

The intermediate document that gets indexed has now a non existing id, and we make sure it doesn't get returned.

fubuki/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,aparo/elasticsearch