Term presence. The below example searches for documents that
must contain “foo”, might contain “bar” and must not contain “baz”: +foo bar -baz
Wildcards. The below example searches for documents with words beginning with “foo”: foo*
Search in specific fields. The following search matches all objects
in "twisted.mail" that matches “search”: +qname:twisted.mail.* +search
Possible fields: 'name', 'qname' (fully qualified name), 'docstring', and 'kind'.
Last two fields are only applicable if "search in docstrings" is enabled.
Fuzzy matches. The following search matches all documents
that have a word within 1 edit distance of “foo”: foo~1
An error indicating that when trying to look up a mail exchange host, a set of canonical name records was found which form a cycle and resolution was abandoned.