Apache Solr Reference Guide Covering Apache Solr 6.0

These processors are included in Solr releases as "contribs", and require additional jars loaded at runtime. See
the README files associated with each contrib for details:
The langid contrib provides :
LangDetectLanguageIdentifierUpdateProcessorFactory : Identifies the language of a set of
input fields using http://code.google.com/p/language-detection
TikaLanguageIdentifierUpdateProcessorFactory : Identifies the language of a set of input fields
using Tika's LanguageIdentifier.
The uima contrib provides:
UIMAUpdateRequestProcessorFactory : Update document(s) to be indexed with UIMA extracted
information.
Update Processor factories you should not modify or remove.
These are listed for completeness, but are part of the Solr infrastructure, particularly SolrCloud. Other than
insuring you do not remove them when modifying the update request handlers (or any copies you make), you will
rarely, if ever, need to change these.
DistributedUpdateProcessorFactory:
Used to distribute updates to all necessary nodes.
NoOpDistributingUpdateProcessorFactory:
An alternative No-Op implementation of
DistributingUpdateProcessorFactory that always returns null. Designed for experts who want to
bypass distributed updates and use their own custom update logic.
LogUpdateProcessorFactory:
A logging processor. This keeps track of all commands that have passed
through the chain and prints them on finish().
RunUpdateProcessorFactory : Executes the update commands using the underlying UpdateHandler.
Almost all processor chains should end with an instance of RunUpdateProcessorFactory unless the user
is explicitly executing the update commands in an alternative custom UpdateRequestProcessorFactory.
Codec Factory
A codecFactory can be specified in solrconfig.xml to determine which Lucene Codec is used when
writing the index to disk.
If not specified, Lucene's default codec is implicitly used, but a solr.SchemaCodecFactory is also available
which supports 2 key features:
Example:
Schema based per-fieldtype configuration for docValuesFormat and postingsFormat - see the Field
Type Definitions and Properties section for more details.
A compressionMode option:
BEST_SPEED (default) is optimized for search speed performance
BEST_COMPRESSION is optimized for disk space usage
BEST_COMPRESSION
Solr Cores and solr.xml
Apache Solr Reference Guide 6.0
466