Fix indexName declaration

Author: lcawl

specification/security/_types/Privileges.ts

@@ -19,7 +19,7 @@
 
 import { Dictionary } from '@spec_utils/Dictionary'
 import { UserDefinedValue } from '@spec_utils/UserDefinedValue'
-import { Id, Indices, Names } from '@_types/common'
+import { Id, IndexName, Indices, Names } from '@_types/common'
 import { QueryContainer } from '@_types/query_dsl/abstractions'
 import { ScriptLanguage } from '@_types/Scripting'
 import { FieldSecurity } from './FieldSecurity'