Stardardize obsolete documentation

This commit updates the documentation to follow the pattern established in logstash-plugins/logstash-output-http#147 for documenting obsolete options.

Author: donoghuc

docs/index.asciidoc

@@ -98,6 +98,9 @@ TIP: Set the `target` option to avoid potential schema conflicts.
 
 This plugin supports the following configuration options plus the <<plugins-{type}s-{plugin}-common-options>> and the <<plugins-{type}s-{plugin}-deprecated-options>> described later.
 
+NOTE: As of version `5.0.0` of this plugin, a number of previously deprecated settings related to SSL have been removed.
+Please check out <<plugins-{type}s-{plugin}-obsolete-options>> for details.
+
 [cols="<,<,<",options="header",]
 |=======================================================================
 |Setting |Input type|Required
@@ -610,54 +613,21 @@ option when authenticating to the Elasticsearch server. If set to an
 empty string authentication will be disabled.
 
 
-[id="plugins-{type}s-{plugin}-removed-options"]
-==== Elasticsearch Input Removed configuration options
+[id="plugins-{type}s-{plugin}-obsolete-options"]
+==== HTTP Output Obsolete Configuration Options
 
-The following configurations will be removed in version 5.0.0.
+WARNING: As of version `5.0.0` of this plugin, some configuration options have been replaced.
+The plugin will fail to start if it contains any of these obsolete options. 
 
-WARNING: These options have been deprecated and will be removed in version 5.0.0. Please use their replacements instead.
 
-[cols="<,<,<",options="header",]
+[cols="<,<",options="header",]
 |=======================================================================
-|Setting|Input type|Replaced by
-| <<plugins-{type}s-{plugin}-ca_file>> |a valid filesystem path|<<plugins-{type}s-{plugin}-ssl_certificate_authorities>>
-| <<plugins-{type}s-{plugin}-ssl>> |<<boolean,boolean>>|<<plugins-{type}s-{plugin}-ssl_enabled>>
-| <<plugins-{type}s-{plugin}-ssl_certificate_verification>> |<<boolean,boolean>>|<<plugins-{type}s-{plugin}-ssl_verification_mode>>
+|Setting|Replaced by
+| ca_file | <<plugins-{type}s-{plugin}-ssl_certificate_authorities>>
+| ssl | <<plugins-{type}s-{plugin}-ssl_enabled>>
+| ssl_certificate_verification | <<plugins-{type}s-{plugin}-ssl_verification_mode>>
 |=======================================================================
 
-[id="plugins-{type}s-{plugin}-ca_file"]
-===== `ca_file`
-deprecated[4.17.0, Will be removed in 5.0.0, replaced by <<plugins-{type}s-{plugin}-ssl_certificate_authorities>>]
-
-This setting will be removed in 5.0.0. Please use <<plugins-{type}s-{plugin}-ssl_certificate_authorities>> instead.
-
-* Value type is <<path,path>>
-* There is no default value for this setting.
-
-SSL Certificate Authority file in PEM encoded format, must also include any chain certificates as necessary.
-
-[id="plugins-{type}s-{plugin}-ssl"]
-===== `ssl`
-deprecated[4.17.0, Will be removed in 5.0.0, replaced by <<plugins-{type}s-{plugin}-ssl_enabled>>]
-
-This setting will be removed in 5.0.0. Please use <<plugins-{type}s-{plugin}-ssl_enabled>> instead.
-
-* Value type is <<boolean,boolean>>
-* Default value is `false`
-
-If enabled, SSL will be used when communicating with the Elasticsearch
-server (i.e. HTTPS will be used instead of plain HTTP).
-
-
-[id="plugins-{type}s-{plugin}-ssl_certificate_verification"]
-===== `ssl_certificate_verification`
-deprecated[4.17.0, Will be removed in 5.0.0, replaced by <<plugins-{type}s-{plugin}-ssl_verification_mode>>]
-
-This setting will be removed in 5.0.0. Please use <<plugins-{type}s-{plugin}-ssl_verification_mode>> instead.
-
-
-* Value type is <<boolean,boolean>>
-* Default value is `true`
 
 Option to validate the server's certificate. Disabling this severely compromises security.
 When certificate validation is disabled, this plugin implicitly trusts the machine