Can you post the mapping for one of the indices? You can run the command below in the "Dev Console" but replace {index-name} with one of the index names.
Looks like your Metricbeat mappings are not setup correctly. This is usually done by running ./metricbeat setup directly against your Elasticsearch cluster. Since you have a custom index pattern you might need to fiddle with the metricbeat.yml some to ensure the index pattern gets setup correctly. OR you could just run the default, then look at what the index template for metricbeat looks like and copy/modify it for your index patterns.
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