solr multiple pdf files indexing all at once. - pdf

Question

Using this command
curl '://localhost:8983/solr/update/extract?literal.id=doc1&commit=true' -F "myfile=#maven_tutorial.pdf"
we can index single pdf files,by specifying our own id(DOC1), in solr. But I want to index many pdf files to solr all at once. let solr keep track of id automatically.
Please help me.

Answer 1

You can use UUID type field as unique key.
First define the UUID field type
<fieldType name="uuid" class="solr.UUIDField" indexed="true" />
Add your id field in the schema.xml
<field name="id" type="uuid" indexed="true" stored="true" multiValued="false"/>
Make this field as the unique key
<uniqueKey>id</uniqueKey>
In solrconfig.xml update the chain for autogenerating the id
<updateRequestProcessorChain name="uuid">
<updateRequestProcessorChain name="uuid">
<processor class="solr.UUIDUpdateProcessorFactory">
<str name="fieldName">id</str>
</processor>
<processor class="solr.RunUpdateProcessorFactory" />
</updateRequestProcessorChain>
Now attach this update chain to the request handler which is extracting the content from the pdf files that you are submitting to solr.
<requestHandler name="/update/extract"
startup="lazy"
class="solr.extraction.ExtractingRequestHandler" >
<lst name="defaults">
<str name="lowernames">true</str>
<str name="uprefix">ignored_</str>
<str name="captureAttr">true</str>
<str name="fmap.a">links</str>
<str name="fmap.div">ignored_</str>
<str name="update.chain">uuid</str>
</lst>