Docs: Fix Jackson reference (#36366)

Link is totally broken.

Author: wilder

docs/java-api/docs/index_.asciidoc

@@ -16,7 +16,7 @@ There are several different ways of generating a JSON document:
 equivalent
 
 * Using a third party library to serialize your beans such as
-http://wiki.fasterxml.com/JacksonHome[Jackson]
+https://github.com/FasterXML/jackson[Jackson]
 
 * Using built-in helpers XContentFactory.jsonBuilder()
 
@@ -60,7 +60,7 @@ json.put("message","trying out Elasticsearch");
 [[java-docs-index-generate-beans]]
 ===== Serialize your beans
 
-You can use http://wiki.fasterxml.com/JacksonHome[Jackson] to serialize
+You can use https://github.com/FasterXML/jackson[Jackson] to serialize
 your beans to JSON. Please add http://search.maven.org/#search%7Cga%7C1%7Cjackson-databind[Jackson Databind]
  to your project. Then you can use `ObjectMapper` to serialize your beans: