Elasticsearch use icu_tokenizer from ICU Analysis plugin -

i trying install icu analysis plugin manually in elasticsearch 1.4.0. have downloaded elasticsearch-analysis-icu-2.4.1.jar, lucene-analyzers-icu-4.10.2.jar , icu4j-54.1.1.jar. plugin appears in console, when try use icu_tokenizer, following error:

noclassdeffounderror[could not initialize class org.apache.lucene.analysis.icu.segmentation.defaulticutokenizerconfig] 

this class exists in lucene-analyzers-icu. there missing?

did try using plugin installer instead of downloading jar files manually suggested in documentation?

./bin/plugin -install elasticsearch/elasticsearch-analysis-icu/2.6.0 

run command , restart server. plugin registered , functional.