Grafana not pulling all entries compared to Google Logs

This is a Grafana SE putting in the issue after talking with the Google team for the Chicago Merchantile Exchange Group (CMEG).

CMEG is running queries and the count that has come back from larger data sets (for example 100k lines) doesn't match the count that we're getting when we click on the "run query in Google Logs" box. This has been repeatable in CME's environment. We can provide you with more data as needed.

Start by reproducing the reported mismatch with a large query, such as the 100k-line CMEG example, and compare the Grafana count with the result from the "run query in Google Logs" link. Determine what additional CMEG data is needed to isolate the cause; done means the two query results agree for the reproduced case.

Written by the indexing model from the issue text.