参考资料：
http://wiki.apache.org/solr/ExtractingRequestHandler#Sending_documents_to_Solr
/update
标准的update request handler，适用于XML，JSON，CSV或者JAVABIN文件类型
<requestHandler name="/update" class="solr.UpdateRequestHandler">
<lst name="defaults">
<str name="update.chain">uuid</str>
</lst>
</requestHandler>
/update/extract
除了以上标准文件之外的文件，可通过此配置来为文件建索引
依赖包
<lib dir="../../dist/" regex="apache-solr-cell-\d.*\.jar" />
<lib dir="../../contrib/extraction/lib" regex=".*\.jar" />
常规配置
<requestHandler name="/update/extract"
startup="lazy"
class="solr.extraction.ExtractingRequestHandler" >
<lst name="defaults">
<str name="xpath">/xhtml:html/xhtml:body/descendant:node()</str>
<str name="capture">content</str>
<str name="fmap.meta">attr_meta_</str>
<str name="uprefix">attr_</str>
<str name="lowernames">true</str>
<str name="update.chain">uuid</str>
</lst>
</requestHandler>