Hi Goran Jaric.
Thanks for the issue. Yeah, sometimes the backends behave differently.

We're going to force the Elasticsearch backend to the Lucene's defaults. The solution #3 Yoann Rodière mentioned.
In particular, we're going to force the default minimum should match to 0 if the should has some must as a sibling and is inside a filter predicate.

Fix will be applied to the major 6.