remove obsolete option ssl (#304)

Author: jsvd

CHANGELOG.md

@@ -1,5 +1,8 @@
+## 9.0.0
+  - Removed obsolete `ssl` option
+
 ## 8.3.1
- - Added support for kafka property ssl.endpoint.identification.algorithm #302(https://github.com/logstash-plugins/logstash-input-kafka/pull/302)
+  - Added support for kafka property ssl.endpoint.identification.algorithm #302(https://github.com/logstash-plugins/logstash-input-kafka/pull/302)
 
 ## 8.3.0
   - Changed Kafka client version to 2.1.0

lib/logstash/inputs/kafka.rb

@@ -159,8 +159,6 @@ class LogStash::Inputs::Kafka < LogStash::Inputs::Base
   config :topics_pattern, :validate => :string
   # Time kafka consumer will wait to receive new messages from topics
   config :poll_timeout_ms, :validate => :number, :default => 100
-  # Enable SSL/TLS secured communication to Kafka broker.
-  config :ssl, :validate => :boolean, :obsolete => "Use security_protocol => 'SSL'"
   # The truststore type.
   config :ssl_truststore_type, :validate => :string
   # The JKS truststore path to validate the Kafka broker's certificate.

logstash-input-kafka.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name            = 'logstash-input-kafka'
-  s.version         = '8.3.1'
+  s.version         = '9.0.0'
   s.licenses        = ['Apache-2.0']
   s.summary         = "Reads events from a Kafka topic"
   s.description     = "This gem is a Logstash plugin required to be installed on top of the Logstash core pipeline using $LS_HOME/bin/logstash-plugin install gemname. This gem is not a stand-alone program"