Remove doc links from config template

The config template that ships with Elasticsearch distributions contains
links to various pieces of documentation. Links go out of date and get
broken. This commit removes such links from the config template.

Relates elastic#22553

distribution/src/main/resources/config/elasticsearch.yml

@@ -7,8 +7,8 @@
 # The primary way of configuring a node is via this file. This template lists
 # the most important settings you may want to configure for a production cluster.
 #
-# Please see the documentation for further information on configuration options:
-# <https://www.elastic.co/guide/en/elasticsearch/reference/current/settings.html>
+# Please consult the documentation for further information on configuration options:
+# https://www.elastic.co/guide/en/elasticsearch/reference/index.html
 #
 # ---------------------------------- Cluster -----------------------------------
 #
@@ -58,8 +58,7 @@
 #
 #http.port: 9200
 #
-# For more information, see the documentation at:
-# <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html>
+# For more information, consult the network module documentation.
 #
 # --------------------------------- Discovery ----------------------------------
 #
@@ -68,21 +67,19 @@
 #
 #discovery.zen.ping.unicast.hosts: ["host1", "host2"]
 #
-# Prevent the "split brain" by configuring the majority of nodes (total number of nodes / 2 + 1):
+# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
 #
 #discovery.zen.minimum_master_nodes: 3
 #
-# For more information, see the documentation at:
-# <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-discovery.html>
+# For more information, consult the zen discovery module documentation.
 #
 # ---------------------------------- Gateway -----------------------------------
 #
 # Block initial recovery after a full cluster restart until N nodes are started:
 #
 #gateway.recover_after_nodes: 3
 #
-# For more information, see the documentation at:
-# <http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-gateway.html>
+# For more information, consult the gateway module documentation.
 #
 # ---------------------------------- Various -----------------------------------
 #