Essence.Document.concordance

You're seeing just the function concordance, go back to Essence.Document module for more information.
Link to this function

concordance(doc, token, n \\ 20)

Specs

concordance(
  doc :: %Essence.Document{
    meta: term(),
    nested_tokens: term(),
    text: term(),
    type: term(),
    uri: term()
  },
  token :: String.t(),
  n :: number()
) :: :ok

Pretty prints all occurrences of token in the given Essence.Document, doc. Prints n (default=20) characters of context.