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Doc: tweak textsearch.sgml for SEO purposes.

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Google seems to like to return textsearch.html for queries about
GIN and GiST indexes, even though it's not a primary reference
for either.  It seems likely that that's because those keywords
appear in the page title.  Since "GIN and GiST Index Types" is
not a very apposite title for this material anyway, rename the
section in hopes of stopping that.

Also provide explicit links to the GIN and GiST chapters, to help
anyone who finds their way to this page regardless.

Per gripe from Jan Piotrowski.  Back-patch to supported branches.
(Unfortunately Google is likely to continue returning the 9.1
version of this page, but improving that situation is a matter
for the www team.)

Discussion: https://postgr.es/m/164978902252.1276550.9330175733459697101@wrigleys.postgresql.org
This commit is contained in:
Tom Lane 2022-04-12 18:21:04 -04:00
parent 3a95dfe402
commit 8320a34d38
1 changed files with 8 additions and 2 deletions
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doc/src/sgml/textsearch.sgml
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@ -3618,7 +3618,7 @@ SELECT plainto_tsquery('supernovae stars');
</sect1> </sect1>
<sect1 id="textsearch-indexes"> <sect1 id="textsearch-indexes">
<title>GIN and GiST Index Types</title> <title>Preferred Index Types for Text Search</title>
<indexterm zone="textsearch-indexes"> <indexterm zone="textsearch-indexes">
<primary>text search</primary> <primary>text search</primary>
@ -3627,10 +3627,16 @@ SELECT plainto_tsquery('supernovae stars');
<para> <para>
There are two kinds of indexes that can be used to speed up full text There are two kinds of indexes that can be used to speed up full text
searches. searches:
<link linkend="gin"><acronym>GIN</acronym></link> and
<link linkend="gist"><acronym>GiST</acronym></link>.
Note that indexes are not mandatory for full text searching, but in Note that indexes are not mandatory for full text searching, but in
cases where a column is searched on a regular basis, an index is cases where a column is searched on a regular basis, an index is
usually desirable. usually desirable.
</para>
<para>
To create such an index, do one of:
<variablelist> <variablelist>