Problem using Elasticsearch input module

I'm trying to use the elasticsearch input module to read an index and save it as an json-file on a share. My problem is that it never stop getting data until the disk is full.

I have an index and Kibana says its about 50Gb but when I stop my logstash-process the file is 1Tb and I can se that it have read the same records many times. How can I limit the module to read the index only once?

Here is my conf in logstash

input {
    elasticsearch {
        hosts => ["myhost"]
        user => "elastic"
        password => "password"
        ca_file => "cert"
        index => "winlogbeat-7.5.0-new-2020.01.01"
        size => 500
        scroll => "5m"
        ssl => true

Best regards

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