set default_codec doc attribute

Author: jsvd

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 4.3.9
+  - Docs: Set the default_codec doc attribute.
+
 ## 4.3.8
   - [#273](https://github.com/logstash-plugins/logstash-input-jdbc/issues/273) Clarify use of use_column_value. Make last_run_metadata_path reference in record_last_run entry clickable.
 

docs/index.asciidoc

@@ -1,5 +1,6 @@
 :plugin: jdbc
 :type: input
+:default_codec: plain
 
 ///////////////////////////////////////////
 START - GENERATED VARIABLES, DO NOT EDIT!
@@ -485,3 +486,5 @@ to `false`, `:sql_last_value` reflects the last time the query was executed.
 
 [id="plugins-{type}s-{plugin}-common-options"]
 include::{include_path}/{type}.asciidoc[]
+
+:default_codec!:

logstash-input-jdbc.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name = 'logstash-input-jdbc'
-  s.version         = '4.3.8'
+  s.version         = '4.3.9'
   s.licenses = ['Apache License (2.0)']
   s.summary = "Creates events from JDBC data"
   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"