Allmost all processor chains should end with an instance of RunUpdateProcessorFactory unless the user is explicitly executing the update commands in an alternative custom !UpdateRequestProcessorFactory.
At most one processor may be configured as the "default". if no processor is configured as a default, then an implicit default useing LogUpdateProcessorFactory and RunUpdateProcessorFactory is created for you.
Selecting the UpdateChain for Your Request
Once one or more update chains are defined, you may select one on the update request through the parameter update.chain
Example: http://localhost:8983/solr/update/xml?update.chain=mychain.
Read full article from UpdateRequestProcessor - Solr Wiki
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