Add breaking changes docs for input-elasticsearch

This commit follows the pattern established in
elastic#16701 for indicating obsolete ssl
settings in logstash core plugins.

docs/static/breaking-changes-90.asciidoc

@@ -46,4 +46,21 @@ removed and their replacements.
 | truststore_type |<<plugins-outputs-http-ssl_truststore_type>>
 |=======================================================================
 
-====
+====
+
+[discrete]
+[[input-elasticsearch-ssl-9.0]]
+.`logstash-input-elasticsearch`
+
+[%collapsible]
+====
+
+[cols="<,<",options="header",]
+|=======================================================================
+|Setting|Replaced by
+| ssl |<<plugins-inputs-elasticsearch-ssl_enabled>>
+| ca_file |<<plugins-inputs-elasticsearch-ssl_certificate_authorities>>
+| ssl_certificate_verification |<<plugins-inputs-elasticsearch-ssl_verification_mode>>
+|=======================================================================
+
+====