Elasticsearch index has multiple document ids

I am using Logstash / Elasticsearch (8.5.3) and am indexing json data.
In logstash I use http input plugin, filter plugins and elasticsearch output.

Currently the auto generated @version field in logstash filter is removed and document id in elasticsearch output is my custom and unique id.

I displayed the index in kibana discover and noticed in field statistics that the count of my custom id is 5000 and the distinct values are 4950.

I suppose that since I removed the @version in filter, elasticsearch indexes the same document id (custom id) more than once, although they are just updated custom ids are.

Can it be the reason?

Can you share 2 documents with the same "id"

Also, can you share your logstash.conf

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