[BUG]Traces Pie Chart not showing all services

[YANG-DB]

What is the bug?
The Observability Trace Analytics Traces time breakdown Pie chart viz is currently only showing (default) 10 results (services) instead of all the returning services.

What is the expected behavior?
The Trace Analytics Traces time breakdown Pie chart viz should change the default size of the terms aggregation to 500

Do you have any screenshots?

[dblock]

[Catch All Triage - 1, 2, 3]