Alexandre, I did not because the default value of 5 was sufficient for the
number of results I am getting back. It is a result set of 7 documents
total and each group should have at max 2 documents in my case.
Groping feature (as opposed to collapse-expand feature) is working as
expected. I am not sure why collapse-expand feature is not working
correctly (especially expand, collapse is working fine)

Michael, I don't want to filter expand result set further. All I want is
basically un-collapse the collapsed result set. I tried expand.q=*:* just
for the experimentation.  There was definitely a change in 'expanded'
section but it was incorrect. There were only two documents with same y
value for X field in original result set but 'expanded' section shows 5
documents with value y grouped into one group. Some of those documents are
not even returned in original result set.

On Thu, May 20, 2021 at 1:46 PM Michael Gibney <mich...@michaelgibney.net>
wrote:

> Depending on what your goals/expectations are, it could also be worth
> noting the `expand.q` and `expand.fq` params, which are applied when
> fetching "expanded docs" (intersecting with the union of
> `expand.field` result values). In cases where you want to "pivot" to
> an unrestricted set of related clustered results, it may be helpful to
> specify `expand.q=*:*`, or something similar.
>
> On Thu, May 20, 2021 at 1:20 PM Alexandre Rafalovitch
> <arafa...@gmail.com> wrote:
> >
> > Did you try expand.rows parameter for how many items to include in each
> group?
> > https://solr.apache.org/guide/8_7/collapse-and-expand-results.html
> >
> > Regards,
> >    Alex.
> >
> > On Thu, 20 May 2021 at 13:02, gnandre <arnoldbron...@gmail.com> wrote:
> > >
> > > Hi,
> > >
> > > I am using Solr 8.5.2 (non-SolrCloud) mode. It is a non-sharded
> scenario. I
> > > am trying to collapse the resultset based on one of the string fields
> (say
> > > X). Collapse query works as expected. It collapses the result set by
> > > excluding the documents that have the same field X and retains only
> the top
> > > raking document from each collapsed group.
> > >
> > > Now, I want to expand the collapsed results to achieve similar
> > > functionality like result grouping. However, when I add expand=true to
> > > query, the returned expanded section doesn't include all collapsed
> groups.
> > > It also doesn't include all collapsed documents for the collapsed
> groups
> > > returned. Is there some issue with the 'expand' feature?
>

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