Support normalizer on wildcard field

Resolves opensearch-project/opensearch-java#1153

Author: lukas-krecan

CHANGELOG.md

@@ -68,6 +68,8 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added `SimplePatternTokenizer` and `SimplePatternSplitTokenizer` ([#820](https://github.com/opensearch-project/opensearch-api-specification/pull/820))
 - Added `optional_extended_plugins` field to `PluginStats` ([#814](https://github.com/opensearch-project/opensearch-api-specification/pull/814))
 - Added `id` & `group_by` fields to `TopQuery` ([#814](https://github.com/opensearch-project/opensearch-api-specification/pull/814))
+- Added `normalizer` to `WildcardProperty` ([#847](https://github.com/opensearch-project/opensearch-api-specification/pull/847))
+
 
 ### Removed
 - Removed unsupported `_common.mapping:SourceField`'s `mode` field and associated `_common.mapping:SourceFieldMode` enum ([#652](https://github.com/opensearch-project/opensearch-api-specification/pull/652))