pgbench - Grafana dashboard does not print graphs for Latency Report, Result summary is also empty.

**Description**
pgbench - Grafana dashboard
ERROR: Grafana dashboard does not print graphs for Latency Report, Result summary is also empty.
OpenShift version: 4.9.29
Elasticsearch (ECK) operator version: 2.2.0
Grafana operator version: 4.4.1
Grafana datasource index: ripsaw-pgbench-summary
Grafana dashboard:
https://github.com/cloud-bulldozer/performance-dashboards template pgbench-dashboard.jsonnet (https://github.com/cloud-bulldozer/performance-dashboards/blob/master/templates/pgbench-dashboard.jsonnet)

**Grafana dashboard**

**Index data example**
[ripsaw-pgbench-summary_index_data_example.txt](https://github.com/cloud-bulldozer/performance-dashboards/files/8938869/ripsaw-pgbench-summary_index_data_example.txt)

**Logs example**
[pgbench-1-dbs-client.log](https://github.com/cloud-bulldozer/performance-dashboards/files/8938874/pgbench-1-dbs-client.log)

Start with templates/pgbench-dashboard.jsonnet and inspect the provided ripsaw-pgbench-summary index data and pgbench-1-dbs-client.log examples. Compare the dashboard’s Latency Report and Result summary panels with the available data. Done means both sections render populated graphs and summary values in Grafana.

Written by the indexing model from the issue text.