Add and set branch attribute

Author: karenzone

docs/index.asciidoc

@@ -1,6 +1,7 @@
 :plugin: elasticsearch
 :type: output
 :no_codec:
+:branch: current
 
 ///////////////////////////////////////////
 START - GENERATED VARIABLES, DO NOT EDIT!
@@ -29,8 +30,8 @@ This output only speaks the HTTP protocol as it is the preferred protocol for
 interacting with Elasticsearch. In previous versions it was possible to
 communicate with Elasticsearch through the transport protocol, which is now
 reserved for internal cluster communication between nodes
-https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-transport.html[communication between nodes].
-Using the https://www.elastic.co/guide/en/elasticsearch/reference/current/java-clients.html[transport protocol]
+https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/modules-transport.html[communication between nodes].
+Using the https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/java-clients.html[transport protocol]
 to communicate with the cluster has been deprecated in Elasticsearch 7.0.0 and
 will be removed in 8.0.0
 
@@ -91,7 +92,10 @@ Each Elasticsearch output is a new client connected to the cluster:
  * it has to initialize the client and connect to Elasticsearch (restart time is longer if you have more clients)
  * it has an associated connection pool
 
-In order to minimize the number of open connections to Elasticsearch, maximize the bulk size and reduce the number of "small" bulk requests (which could easily fill up the queue), it is usually more efficient to have a single Elasticsearch output.
+In order to minimize the number of open connections to Elasticsearch, maximize
+the bulk size and reduce the number of "small" bulk requests (which could easily
+fill up the queue), it is usually more efficient to have a single Elasticsearch
+output.
 
 Example:
 [source,ruby]
@@ -103,8 +107,11 @@ Example:
 
 **What to do in case there is no field in the event containing the destination index prefix?**
 
-You can use the `mutate` filter and conditionals to add a `[@metadata]` field (see https://www.elastic.co/guide/en/logstash/current/event-dependent-configuration.html#metadata) to set
-the destination index for each event. The `[@metadata]` fields will not be sent to Elasticsearch.
+You can use the `mutate` filter and conditionals to add a `[@metadata]` field
+(see
+https://www.elastic.co/guide/en/logstash/{branch}/event-dependent-configuration.html#metadata)
+to set the destination index for each event. The `[@metadata]` fields will not
+be sent to Elasticsearch.
 
 Example:
 [source,ruby]
@@ -224,7 +231,7 @@ enabled by default for HTTP and for Elasticsearch versions 5.0 and later.
 You don't have to set any configs in Elasticsearch for it to send back a
 compressed response. For versions before 5.0, or if HTTPS is enabled,
 `http.compression` must be set to `true`
-https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-http.html#modules-http[in
+https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/modules-http.html#modules-http[in
 Elasticsearch] to take advantage of response compression when using this plugin.
 
 For requests compression, regardless of the Elasticsearch version, enable the
@@ -332,7 +339,7 @@ The Elasticsearch action to perform. Valid actions are:
 - A sprintf style string to change the action based on the content of the event. The value `%{[foo]}`
   would use the foo field for the action
 
-For more details on actions, check out the http://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html[Elasticsearch bulk API documentation]
+For more details on actions, check out the http://www.elastic.co/guide/en/elasticsearch/reference/{branch}/docs-bulk.html[Elasticsearch bulk API documentation]
 
 [id="plugins-{type}s-{plugin}-api_key"]
 ===== `api_key`
@@ -342,7 +349,7 @@ For more details on actions, check out the http://www.elastic.co/guide/en/elasti
 
 Authenticate using Elasticsearch API key. Note that this option also requires enabling the `ssl` option.
 
-Format is `id:api_key` where `id` and `api_key` are as returned by the Elasticsearch https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-create-api-key.html[Create API key API].
+Format is `id:api_key` where `id` and `api_key` are as returned by the Elasticsearch https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/security-api-create-api-key.html[Create API key API].
 
 [id="plugins-{type}s-{plugin}-bulk_path"]
 ===== `bulk_path`
@@ -369,7 +376,7 @@ The .cer or .pem file to validate the server's certificate
 
 Cloud authentication string ("<username>:<password>" format) is an alternative for the `user`/`password` pair.
 
-For more details, check out the https://www.elastic.co/guide/en/logstash/current/connecting-to-cloud.html[Logstash-to-Cloud documentation]
+For more details, check out the https://www.elastic.co/guide/en/logstash/{branch}/connecting-to-cloud.html[Logstash-to-Cloud documentation]
 
 [id="plugins-{type}s-{plugin}-cloud_id"]
 ===== `cloud_id`
@@ -379,7 +386,7 @@ For more details, check out the https://www.elastic.co/guide/en/logstash/current
 
 Cloud ID, from the Elastic Cloud web console. If set `hosts` should not be used.
 
-For more details, check out the https://www.elastic.co/guide/en/logstash/current/connecting-to-cloud.html[Logstash-to-Cloud documentation]
+For more details, check out the https://www.elastic.co/guide/en/logstash/{branch}/connecting-to-cloud.html[Logstash-to-Cloud documentation]
 
 [id="plugins-{type}s-{plugin}-doc_as_upsert"]
 ===== `doc_as_upsert`
@@ -430,7 +437,7 @@ If you don't set a value for this option:
 ** When Logstash provides a `pipeline.ecs_compatibility` setting, its value is used as the default
 ** Otherwise, the default value is `disabled`.
 
-Controls this plugin's compatibility with the https://www.elastic.co/guide/en/ecs/current/index.html[Elastic Common Schema (ECS)],
+Controls this plugin's compatibility with the https://www.elastic.co/guide/en/ecs/{branch}/index.html[Elastic Common Schema (ECS)],
 including the installation of ECS-compatible index templates.
 The value of this setting affects the _default_ values of:
 
@@ -477,7 +484,7 @@ If you have custom firewall rules you may need to change this
   * Default value is `[//127.0.0.1]`
 
 Sets the host(s) of the remote instance. If given an array it will load balance requests across the hosts specified in the `hosts` parameter.
-Remember the `http` protocol uses the http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-http.html#modules-http[http] address (eg. 9200, not 9300).
+Remember the `http` protocol uses the http://www.elastic.co/guide/en/elasticsearch/reference/{branch}/modules-http.html#modules-http[http] address (eg. 9200, not 9300).
 
 Examples:
 
@@ -487,10 +494,14 @@ Examples:
     `["https://127.0.0.1:9200"]`
     `["https://127.0.0.1:9200/mypath"]` (If using a proxy on a subpath)
 
-It is important to exclude http://www.elastic.co/guide/en/elasticsearch/reference/current/modules-node.html[dedicated master nodes] from the `hosts` list
-to prevent LS from sending bulk requests to the master nodes.  So this parameter should only reference either data or client nodes in Elasticsearch.
+Exclude
+http://www.elastic.co/guide/en/elasticsearch/reference/{branch}/modules-node.html[dedicated
+master nodes] from the `hosts` list to prevent Logstash from sending bulk
+requests to the master nodes. This parameter should reference only data or
+client nodes in Elasticsearch.
 
-Any special characters present in the URLs here MUST be URL escaped! This means `#` should be put in as `%23` for instance.
+Any special characters present in the URLs here MUST be URL escaped! This means
+`#` should be put in as `%23` for instance.
 
 [id="plugins-{type}s-{plugin}-http_compression"]
 ===== `http_compression`
@@ -726,7 +737,7 @@ Set max interval in seconds between bulk retries.
   * Default value is `1`
 
 The number of times Elasticsearch should internally retry an update/upserted document
-See the https://www.elastic.co/guide/en/elasticsearch/guide/current/partial-updates.html[partial updates]
+See the https://www.elastic.co/guide/en/elasticsearch/guide/{branch}/partial-updates.html[partial updates]
 for more info
 
 [id="plugins-{type}s-{plugin}-routing"]
@@ -958,11 +969,12 @@ See https://www.elastic.co/blog/elasticsearch-versioning-support.
 
 The version_type to use for indexing.
 See https://www.elastic.co/blog/elasticsearch-versioning-support.
-See also https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-index_.html#_version_types
+See also https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/docs-index_.html#_version_types
 
 
 
 [id="plugins-{type}s-{plugin}-common-options"]
 include::{include_path}/{type}.asciidoc[]
 
+:branch!:
 :no_codec!: