Unclear message when eventstats receives no aggregation argument #489

Describe the bug

%dpl
index=example earliest=-5y |eventstats

The above query returns:
Index: 0, Size: 0

Expected behavior

It should perform various aggregations like count, average,sum, distinct_count e.t.c on all available fields

How to reproduce

Run the query
Screenshots

Software version

pth_10 version: 8.3.1
pth_03 version: 9.3.0

Desktop (please complete the following information if relevant):

• OS:
• Browser:
• Version:

Additional context