Mention indexing when describing filter options

When describing the NIS and compat filtering options, remind the reader
that indexing the involved attributes helps.

2 files changed, 6 insertions, 2 deletions

diff --git a/doc/nis-configuration.txt b/doc/nis-configuration.txt
index 8f8df9f..4b87854 100644
--- a/doc/nis-configuration.txt
+++ b/doc/nis-configuration.txt
@@ -80,7 +80,9 @@ beneath the plugin's entry.  These attributes are recognized:
  * nis-filter (optional)
    The filter which is used to select entries for conversion, given as
    an LDAP search filter.  A default value, which varies based on the
-   name of the map, is used if none is specified.
+   name of the map, is used if none is specified.  Attributes mentioned
+   in the filter should be indexed and defined with a proper syntax and
+   equality test in the directory server schema.
  * nis-key-format (required if nis-keys-format is not set)
    A format specifier which the plugin will use to convert the contents
    of the directory server entry into a key for the NIS map.  If the
diff --git a/doc/sch-configuration.txt b/doc/sch-configuration.txt
index e07a4af..aa9ec41 100644
--- a/doc/sch-configuration.txt
+++ b/doc/sch-configuration.txt
@@ -32,7 +32,9 @@ beneath the plugin's entry.  These attributes are recognized:
    found.
  * schema-compat-search-filter (required)
    A filter used to select which candidate entries should have new
-   entries created for them in this container.
+   entries created for them in this container.  Attributes mentioned
+   in the filter should be indexed and defined with a proper syntax and
+   equality test in the directory server schema.
  * schema-compat-entry-rdn (required)
    The RDN to give to generated entries, which will be stored as
    children of this container.