Headless bundle content file should be named "index.md" -- not "_index.md". We should improve the documentation about this, but the main point about being headless is that is does not show up in Hugo's page collections.
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How much more clear can the documentation be made? (1) The headless bundle section is a subsection in **leaf bundle** section (2) it further says "A leaf bundle can be made headless by adding below in the Front Matter (in the index.md)" (contd)
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(3) And finally this in the "note" shortcode i.e. in a blockquote: "Only leaf bundles can be made headless."

3:15 AM · May 23, 2018

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