from 1.
Target <target> must be defined.
+.TP
+.B filter <pattern>
+This directive allows specifying a
+.BR regex (5)
+pattern to indicate what search filter terms are actually served by a target.
+
+In a search request, if the search filter matches the \fIpattern\fP
+the target is considered while fulfilling the request; otherwise
+the target is ignored. There may be multiple occurrences of
+the
+.B filter
+directive for each target.
+
.TP
.B idassert\-authzFrom <authz-regexp>
if defined, selects what