_search API - why doesn't it return version by default?

Elastic Stack Elasticsearch
1

When using the _search API if you want the version number of every record to be returned you need to specify that directly. source

    GET /_search
    {
        "version": true,
        "query" : {
            "term" : { "user" : "kimchy" }
        }
    }

Why is this? Is there a performance hit for returning the version with every record?

2

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