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I’ve run into the same problem long time ago – filtering with more like this is just not implemented in haystacks elasticsearch backend.
I’ve made pull request to both pyelasticsearch and haystack to make it work. Pyelasticsearch allows it now, but haystack still have no support (and I’ve closed my pull request).
This commit fixes it in haystack:
https://github.com/jasisz/django-haystack/commit/76473d8eebf49a0fffba025993a533b852aa8578
Source:stackexchange.com