tstats returning zero results for a simple count query

[imrago]

We are ingesting large volume of network data and would like to use tstats to make the searches faster. 

The query 

index=myindex

is returning results as expected, but when I run a basic tstats like

| tstats count where index=myindex

returns zero results. What could be the cause?

Attempted also to use :

| tstats count where index=federated:myindex

but it did not help.

[yuanliu · Accepted solution]

Start diagnosis with this:

| tstats count where index=* by index

Is "myindex" in the list?

[imrago]

thank you, that is a useful query