[TSVB] filer ratio does not understand scripted field

[TomonoriSoejima]

Kibana version: 7.6.2

Elasticsearch version: 7.6.2

Describe the bug:

I was trying to get filter ratio work and the field I inserted at Numerator happened to a scripted field and it was not giving me the expected results.

So I created documents with hardcoded values that the painless script was supposed to generate and as soon as I used that field in Numerator , I got the expected result.

Expected behavior:

Screenshots (if relevant):

• OpenedDays2 is string field

• opendays2 is scripted field

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context:

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[marius-dr]

Same as #13928