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##### 8.1.3.8 Custimozations

`nnir-method-default-engines`
  Alist of server backend - search engine pairs. The default associations are

                (nnimap . imap)
                (nntp . gmane)

`nnir-ignored-newsgroups`
  A regexp to match newsgroups in the active file that should be skipped when searching all groups on a server.
`nnir-summary-line-format`
  The format specification to be used for lines in an nnir summary buffer. All the items from `gnus-summary-line-format' are available, along with three items unique to nnir summary buffers:

                %Z    Search retrieval score value (integer)
                %G    Article original full group name (string)
                %g    Article original short group name (string)

  If nil (the default) this will use `gnus-summary-line-format`.

`nnir-retrieve-headers-override-function`
  If non-nil, a function that retrieves article headers rather than using the gnus built-in function. This function takes an article list and group as arguments and populates the `nntp-server-buffer' with the retrieved headers. It should then return either 'nov or 'headers indicating the retrieved header format. Failure to retrieve headers should return `nil`

  If this variable is nil, or if the provided function returns nil for a search result, `gnus-retrieve-headers` will be called instead."