Return information about offline segments seen in client response

When we run a query and there are offline segments during the query, it seems we are not receiving such information from the response.

We should either make sure there is a flag in response that it is partial result, or maybe just throw an exception

No files, tests, or entry points are named. Start by tracing how query responses represent results when offline segments are encountered, then clarify whether completion means adding a partial-result flag or defining an exception behavior.

Written by the indexing model from the issue text.