Questions

[term] query doesn't support multiple fields, found [FirstName.keyword] and [FirstName.keyword]

Fielddata is disabled on text fields by default. Set fielddata=true on [Age] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead

How to know size of an elasticsearch index using Kibana?

How to see all the indexes in elasticsearch using Kibana?