doc: document the CREATE INDEX "USING" clause

Somehow this was in the syntax but had no description.

Reported-by: robertcorrington@gmail.com
Discussion: https://postgr.es/m/164228771825.31954.2719791849363756957@wrigleys.postgresql.org

Backpatch-through: 10

diff --git a/doc/src/sgml/ref/create_index.sgml b/doc/src/sgml/ref/create_index.sgml
index a5bac9f737368829e8b8b0dba986f61d59f88eac..944fdb4b094a984db897f3c0d7a8e56a826ecf2d 100644 (file)
--- a/doc/src/sgml/ref/create_index.sgml
+++ b/doc/src/sgml/ref/create_index.sgml
@@ -149,6 +149,18 @@ CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] <replaceable class=
       </listitem>
      </varlistentry>
 
+     <varlistentry>
+      <term><literal>USING</literal></term>
+      <listitem>
+       <para>
+        The optional <literal>USING</literal> clause specifies an index
+        type as described in <xref linkend="indexes-types"/>.  If not
+        specified, a default index type will be used based on the
+        data types of the columns.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry>
       <term><literal>INCLUDE</literal></term>
       <listitem>