[TSVB]support range query in filter ratio

[TomonoriSoejima]

Describe the feature:

Originally I was trying to get a percentage for the data and trying to grab the percentage for conditions like OpenedDays >= 7 in Numerator but it was not really working

and after some research, I found this blog which implies that you need to use string field here.

https://www.elastic.co/blog/how-to-display-data-as-a-percentage-in-kibana-visualizations

Filter Ratio selects two sets of documents using query string syntax.
Describe a specific use case for the feature:

I suppose the fact that the range query is not supported per the information above, but it would be nice if we can get it to work in the future.

[elasticmachine]

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

[wylieconlon]

This is not a bug, so I am closing. The filter ratio uses "query string syntax" which is the same as Lucene syntax. To build an open range query in Lucene, you use something like OpenedDays: [7 TO *]