Remove local-metadata from PropertyBase (#1979)

(cherry picked from commit 0f1a368)

Author: stevejgordon

output/schema/schema.json

@@ -41,7 +41,10 @@ import {
 } from './specialized'
 
 export class PropertyBase {
-  local_metadata?: Metadata
+  /**
+   * Metadata about the field.
+   * @doc_id mapping-meta-field
+   */
   meta?: Dictionary<string, string>
   properties?: Dictionary<PropertyName, Property>
   ignore_above?: integer