Document field type (integer) does not match mapping (keyword)

Elastic Stack Elasticsearch
1

A document in my Elasticsearch cluster has a field whose type conflicts with the mapping for that index. In this case, the mapping type is keyword, whereas the value of the field in the document is an integer.

The field in question in the mapping:

$ curl -sS localhost:9200/indexname/_mapping | jq '.indexname.mappings.properties.foo.properties.should_be_keyword.type'
"keyword"

The field in question in the document (note truncated integer value):

$ curl -sS localhost:9200/indexname/_search -H 'Content-type: application/json' -d '{"query":{"term":{"_id":"1ae3f3cd-0741-4977-ae4b-358033810e28"}}}' | jq '.hits.hits[0]._source.foo.should_be_keyword'
1364401746309800000

Can anyone explain this behavior?

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