title: How to reindex all docs in Solr data
body: <p>I am going to change some field types in the schema, so seems it must re-index all the docs in current Solr index data with this kind of change.</p>
  <p>The question is about how to &quot;re-index&quot; all the docs?
  One solution that I can think of is to &quot;query&quot; all docs through the search interface and dump a large file in XML or JSON, then convert it to the input XML format for Solr, and load it back to Solr again to make the schema change happen.</p>
  <p>Is there some better way can do this more efficiently? Thanks for your suggestion.</p>