Merge pull request #19962 from prathamesh-sonpatki/nodoc-validate-index-length

 Nodoc validate_index_length! method

activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb

@@ -1049,7 +1049,7 @@ def foreign_key_name(table_name, options) # :nodoc:
         end
       end
 
-      def validate_index_length!(table_name, new_name)
+      def validate_index_length!(table_name, new_name) # :nodoc:
         if new_name.length > allowed_index_name_length
           raise ArgumentError, "Index name '#{new_name}' on table '#{table_name}' is too long; the limit is #{allowed_index_name_length} characters"
         end