change schema from indexed field to stored field without re-index in Solr

We want to change schema from indexed field to stored field, for example

orig one : <field name="cat" type="string" indexed="true" stored="false">

new one: <field name="cat" type="string" indexed="false" stored="true">

The tool or com开发者_C百科mands to help to achieve this without re-index all the documents?

If you change your schema you have to re-index your documents. You could use multiple cores to avoid a restart of the servlet container, see Core RELOAD but you do need to re-index.

This is not possible. When field is not stored, you have no option to fetch content for this field from index.

Yes... you really can't do that, you must have to re-index.

But re-index cannot be a problem, if you have a lot of docs you can use one of the SOLR imports or if you have a slave solr that is replicating with a master, you can stop the replication, re-index in master, and start the replication again.

re-index is boring right? ^^