Watch for changes in documents that match a specific criteria

Working with Data Node.js Frameworks
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14

Thanks fo ryour time that did the trick. The next stumbling block is to match a language as well. The required language is an element of an array (where the subject speaks mor than one language.
language:[“english”, “german”, “french”]
I am not sure how to formulate the request.

const pipeline =[
    {
      $match: {
        'fullDocument.available': true,
        'fullDocument.language': {$in:['english']}
    }
    }
  ];

Doesnt work.
What is the correct formulation please? The documentation is quaite vague.
On another note, where can I find documentation on the fullDocument notation and the allowed options in the watch(pipeline, options) function.
Thanks again for helping me learn.
Regards
John