I have read the exact same question but the problem was automatically closed.
"When configuring an index pattern in Kibana, it's unable to fetch the field details of a particular index in Kibana, if I am using a predefined custom mapping when creating the index, and if i upload the data without predefined mapping it's working.
Index exists in elastic search and have set of fields.
I want to be able to create my own mapping with predefined data types for my object fields"
How do you know it's unable to fetch the field details?
data types are unknown and no fields are visible for aggregations except te default ones _id, _source etc.
Are there errors in Kibana?
no errors in Kibana
Are there errors in the Kibana log?
-no errors in Kibana log
Was the data loaded with one of our products like Logstash or a Beat?
No, the index and default mapping with PUT request via Kibana console and the data objects via script with 'curl -H "Content-Type: application/json" -XPOST "https://domain_endpoint/index_name/_bulk" --data-binary "@example.json"';
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