Different wildcard handling

I'm having a crisis situation with elasticsearch here, we use a couchdb
river, and I get different results running on my local ES and the
production one.

It looks like for example that wildcards, something like
StringQuery("responding* to*", default_operator='AND')
works in one and doesn't work in the other one.

We didn't touch ES, but we are ruling out all the things which can't be and
I'm finishing the possibilities.
The only thing maybe might be the mapping, which is dynamically updated
from the river.

The problem is that the mapping is massive and not really easy to compare,
and I don't see how that should have just changed by itself either.
Any idea?
Thanks

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