Hi Sindhuja, I believe this change is the cause of your issue.
The analytics apis for aggregations have been enhanced to be more accurate, a side effect of which is needing the latest SDK version so the new classes are available. You'll need to select one of these
The AnalyticsQueryFilter() class was modified in the same way as the Query classes, you'll just need to select the one that corresponds to the prefix you're using. e.g. ConversationAggregateQueryFilter.
As for the docs, thanks for the catch. Those need to be updated to reflect the improvements; however, the general outline of the example should still be current if the correct classes are being used.
For SDK version-specific change logs, look at releaseNotes.md in the repo and see the historical revisions of that file for previous versions. You can also browse the historical commits for the entire repo to see the exact source code changes.