Update Existing document through logstash

logstash pipeline is not updating existing document for the same id, I have couples of fields which got updated frequestly for example Last Modified Date.

I have below logstash config.

output {		
   elasticsearch {
        id => "api-main"
        hosts => ["https://localhost:9200"]
        #ssl => true
        #cacert => "/usr/share/logstash/certs/http_ca.crt"
        cacert => '/etc/logstash/config/certs/ca.crt'
        user => "elastic"
        password => "xxxxxxx"
	    index => "change-dev-%{+YYYY-MM-dd}"
	    #document_id => "%{[response][body][entries][values][Request_ID]}"
        document_id => "%{[response][body][entries][values][Change_ID]}"
        #document_id => "%{[@metadata][_id]}"
        action => "update"
        doc_as_upsert => true
        #data_stream_sync_fields => true
    stdout {
        codec => rubydebug {
            metadata => true

If I use Action => create then the index is created matching index template using Data Stream,
but then later if there is an update in the field for example ('Last Modified date' field is changed ) but logstash doesn't update that field in elasticsearch . I tried to use update and doc_as_upsert but it's not working.

I am also getting below exception in logs.

[WARN ] 2023-03-31 18:37:16.716 [[main]>worker0] elasticsearch - Could not index event to Elasticsearch. status: 400, action: ["update", {:_id=>"CRQ000000000081", :_index=>"change-dev-2023-03-31", :routing=>nil, :retry_on_conflict=>1},
"status"=>400, "error"=>{"type"=>"illegal_argument_exception", "reason"=>"only write ops with an op_type of create are allowed in data streams"}}}

Please suggest.

The index you are trying to update a document in, is it an index or is it a data stream?

It's a data stream

Yeah, well, there is your problem (I think). It is my understanding (which could be wrong) that indexes are for documents and data that you can change/update/delete documents in, while data streams are for write-once/read-many documents.

If my understanding is correct, then the error message you get makes sense: You are only allowed to create documents - not update (or upsert = insert-or-update).

You cannot update a data stream through Logstash, if you need to do this then you need to use normal time-based indices.

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