It does indeed sound like some metrics are not available from your environment. Marvel/ES uses Sigar to collect these metrics (https://support.hyperic.com/display/SIGAR/Home). Each OS has different ways to provide (or not provide) these metrics. If you absolutely cannot get these metrics, you can create a Marvel index template (http://www.elasticsearch.org/guide/en/marvel/current/) and introduce these missing fields that Sigar cannot collect from your environment.
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