Excluding terms in grouping results

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 wan

Stats min and max for each group result

So, I have results like: And want to get a little more info, get min and max values for some field in doc limited to a group like this: I this possible to do with grouping? -- View this message in context: http://lucene.472066.n3.nabble.com/Stats-min-and-max-for-each-group-result-tp3998177.