Visualize: Expected numeric type on field [some_field], but got [string]

Hi,
When going to the index setting I clearly see that the type for field some_field is number.
But in the visualization I'm getting this error when trying to do an "average" on this field-

"Visualize: Expected numeric type on field [some_field], but got [string]"

How can I tell what is the issue here?
I also have other indices which have the same some_field and there it's a string. Could it be the cause? If so, I would love to get an explanation why.

Thanks.

I also have other indices which have the same some_field and there it's a string. Could it be the cause? If so, I would love to get an explanation why.

Do those indices match your kibana index pattern? If not, it shouldn't be a problem.

If you open the network tab of your browser's dev tools you should find an _msearch request when reloading the visualization. Looking at the request and response to/from elasticsearch might help us see what's going on.

Hi @Bargs,
I did as you suggested, the _msearch query is searching the index that shows me these 2 fields as numbers when I look in Kibana settings > Indices.
When I look in elasticsearch at the mapping of my index I see they are strings.. how could it be?

Thanks

Which section are you looking at, "Index Management" or "Index Patterns"?