dongle-the-gadget opened a new issue, #964:
URL: https://github.com/apache/lucenenet/issues/964
### Is there an existing issue for this?
- [X] I have searched the existing issues
### Describe the bug
GroupingSearch might miss some groups, even if searching for docs using
`IndexSearcher.Search` indicates that the group should be present.
For instance, using `IndexSearcher.Search` will reveal a document with field
`name` and value `CreateFileW`, but using `GroupingSearch`, like below:
```cs
GroupingSearch groupingSearch = new("name");
groupingSearch.SetAllGroups(true);
```
contains no group with the `name` being `CreateFileW`.
In addition, the `TotalGroupCount` is inconsistent with that of the real
dataset.
### Expected Behavior
The group should exist in the search, and there should not be a mismatch
between `TotalGroupCount` and the index.
### Steps To Reproduce
A repro repository is here: https://github.com/dongle-the-gadget/TestLucene
The real dataset has documents of the following `name`s:
```
CreateFile2
CreateFile2FromAppW
CreateFileA
CreateFileFromAppW
CreateFileMappingA
CreateFileMappingFromApp
CreateFileMappingW
CreateFileMoniker
CreateFileW
CreateFile2
```
### Exceptions (if any)
_No response_
### Lucene.NET Version
4.8.0-beta00016
### .NET Version
8.0
### Operating System
Windows 11
### Anything else?
_No response_
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