Works perfectly well (and completely hidden as expected)

Thanks for this nifty plugin! Perfect!

You might want to add some documentation since it’s very hidden how it works.

1) After activating the plugin, a <link rel=”search”> tag is added to the header of your webpages.
2) This link points to https://domain.com/wp-json/opensearch/1.1/document and produces an XML document.
3) This document.osdx contains the OpenSearch specification for your website.
4) An additional use case, is downloading this file to your Windows machine. Then you can double-click it to install a search connector to Windows. This lets you search your own website directly from your Windows and Explorer search bars. Just type the first letters of your website name to get it going!

Best,
Marc