For your search query, make sure you don't put a space after the :. So it should be name:heartbeat in the query bar in Kibana. If you add a space, you won't get an error, but you also might not get back the correct results.
Do you want a Data Table of values of count of events per sessionId and titleId? This should be very simple. Just create a new Data Table Visualization and click Split Rows, then select Terms Aggregation, and select your sessionId
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