Get the total number of fields of a given index

Elastic Stack Elasticsearch
1

I am facing update mapping errors on an ES (6.1) index because it seems we reached the limit index.mapping.total_fields.limit. The error is:

Limit of total fields [1200] in index [coin] has been exceeded

However, if I do:

$ curl -X GET "localhost:9200/coin/_mapping?pretty" | grep type | wc -l

I get only 1088.

I would like to properly monitor when we are getting close to the limit, but it's not clear how to fetch the value that is actually used by ES internally. Is there a way to do that?

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