Name: suppress_capabilities
Type: STRING
Default-Value: NULL
Last-Modified: 3.0.0

Suppress the named capabilities from any capability response.  Use the
exact case as it appears in the response, e.g.  "suppress_capabilities:
ESEARCH QRESYNC WITHIN XLIST LIST-EXTENDED" if you have a murder with 2.3.x
backends and don't want clients being confused by new capabilities that
some backends don't support.
