A working example of how to import a Wikipedia dump with Logstash using es_bulk

I'm writing a logstash configuration file for importing a Wikipedia dump, found on https://dumps.wikimedia.org/other/cirrussearch/current/

The dumps are in the es_bulk format, ie one line for the action and id of the document and then a line containing the actual JSON data.

I'm changing codecs to make this work and the JSON codec inputs each line as a document. The es_bulk codec causes a crash and I can't for the life of me understand how a multiline statement would look to make it work.

This is my conf right now:

input {
    file {
        path => "/home/projects/wiki-load/swwikibooks-20201019-cirrussearch-general.json.gz"
        mode => "read"
        codec => "json"
        start_position => "beginning"
        file_completed_action => "log"
        file_completed_log_path => "/home/projects/wiki-load/log.txt"
filter {
    json {
        source => "message"
output {
    elasticsearch {
        hosts => ["localhost:9200"]
        index => "svwiki-20201012"
        document_type => "page"
    stdout {
		codec => rubydebug { metadata => false }

I need to capture the header line and the document line together, keeping the original structure and unique id of the document. Any suggestions here?

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