How can I enable Unicode support in Apache Solr?

I want to enable the Unicode in Solr. Updating the index does not give me an error. But as soon as I try to search some Chinese text, I get an error. I have added the following line to my schema.

The following exception occurs as a result of adding the quoted filter:

org.apache.solr.common.SolrException: Error loading class 'solr.CollationKeyFilterFactory'
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:375)
at org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:390)
at org.apache.solr.util.plugin.AbstractPluginLoader.create(AbstractPluginLoader.java:84)
at org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:141)
at org.apache.solr.schema.IndexSchema.readAnalyzer(IndexSchema.java:835)

<filter class="solr.CollationKeyFilterFactory" language="" strength="primary"/>

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