Excluding terms in grouping results

[Anze <dk...@gmail.com>]

Hello there,

The question is: how to group results by some field (text terms), but
exclude some term from being grouped by. For example there are few documents
with field 'tags':

1. tags: term1 term2 term3
2. tags: term2 term3 term4
3. tags: term1 term2 term4
3. tags: term2 term3 term4

And i want to group by 'tags', so there usually result would be 4 groups,
but, for example i need to exclude 'term4' as group, but still be able to
see documents where 'term4' is present. Is there a way to do this? I can't
use another field, cause there is a lot of these terms, and any term can be
excluded, or even two at once. Another example, may be it help, when i make
request to find ?q=tags:term4, i need group by tags, but exclude term4 to be
a group, as i already searching by this term.

Thank you for your time.



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