Slightly confused by wording on Readme

[brupm]

Thank you for the work on this plugin.

"Elasticsearch Reindexing Plugin provides a feature to create a new index from an existing index. If you want to add new analyzers or make changes to existing fields, you need to re-create your index."

Does this mean that I am not able to use the reindex feature if the new index has new mappings? Seems like that is where most of the usefulness of this tool would lie no?

[marevol]

elasticsearch decides mappings automatically if you do not create a target index before reindexing.

[brupm]

It also let's you manually define custom mappings for attributes to prevent errors by guessing. So It seems my question still stands.

Am I not able to use the reindex feature if the I want to set different mappings for specific attributes on the new index?