rename_replacementedit

This setting is only used by the restore action.

From the Elasticsearch documentation

The rename_pattern and rename_replacement options can be also used to rename indices on restore using regular expression that supports referencing the original text as explained here.

Read more about this setting at http://www.elastic.co/guide/en/elasticsearch/reference/5.4/modules-snapshots.html#_restore

There is no default value.