Solr provides a native way to index structured documents such as XML, JSON, and CSV using index handlers.

The default request handler (which is configured by default) is as follows:

<requestHandler name="/update" class="solr.UpdateRequestHandler" />

Or you can mention them separately in solrconfig.xml:

<requestHandler name="/update/json" class="solr.UpdateRequestHandler">
     <lst name="invariants">
         <str name="stream.contentType">application/json</str>
     </lst>
</requestHandler>
<requestHandler name="/update/csv" class="solr.UpdateRequestHandler">
     <lst name="invariants">
         <str name="stream.contentType">application/csv</str>
     </lst>
</requestHandler>