# Issue about Invalid stemmer class specified CJK **URL:** \ **Category:** Elasticsearch\ **Created:** [March 15, 2021, 11:59am UTC](https://discuss.elastic.co/t/issue-about-invalid-stemmer-class-specified-cjk/267254 "2021-03-15T11:59:21Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![omaquaire](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/omaquaire/32/85554_2.png) [@omaquaire](https://discuss.elastic.co/u/omaquaire)\ **Post date:** [March 15, 2021, 11:59am UTC](https://discuss.elastic.co/t/issue-about-invalid-stemmer-class-specified-cjk/267254/1 "2021-03-15T11:59:21Z")
Dear all, I know there is another topic that was created, but I could not find any usable solutions, and since I have been looking for the solution for hours, I resolute myself to post here. Overall, I know that I use an outdated stack, but it is for a customer, and I cannot really change it, so please forgive me in advance. Currently I use ElasticSearch 5.5, with OpenJDK 1.8 and a Magento 2.2.3 I am not very strong in ElasticSearch so I am quite confused about it. The overall need is to be able to make Magento 2.2.3 work with ElasticSearch over a Chinese website. Then I had several errors that I fixed : - Installed the plugins analysis-icu & analysis-smartcn, and they are loaded \*\* [2021-03-15T18:55:17,710][INFO][o.e.p.PluginsService] [MSpxtmr] loaded plugin [analysis-icu] \*\* [2021-03-15T18:55:17,710][INFO][o.e.p.PluginsService] [MSpxtmr] loaded plugin [analysis-smartcn] - I had problems with total fields limit to 1000, I updated it to 3000 - Now when Magento tries to create an index in Chinese (apparently) it does not work ```auto [2021-03-15T19:02:30,740][DEBUG][o.e.a.b.TransportShardBulkAction] [MSpxtmr] [magento2_product_2_v1][4] failed to execute bulk item (index) BulkShardRequest [[magento2_product_2_v1][4]] containing [116] requests and a refresh java.lang.IllegalArgumentException: Invalid stemmer class specified: Cjk at org.apache.lucene.analysis.snowball.SnowballFilter.(SnowballFilter.java:83) ~[lucene-analyzers-common-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:30:03] at org.elasticsearch.index.analysis.StemmerTokenFilterFactory.create(StemmerTokenFilterFactory.java:256) ~[elasticsearch-5.5.3.jar:5.5.3] at org.elasticsearch.index.analysis.CustomAnalyzer.createComponents(CustomAnalyzer.java:86) ~[elasticsearch-5.5.3.jar:5.5.3] at org.apache.lucene.analysis.AnalyzerWrapper.createComponents(AnalyzerWrapper.java:134) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46] at org.apache.lucene.analysis.AnalyzerWrapper.createComponents(AnalyzerWrapper.java:134) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46] at org.apache.lucene.analysis.Analyzer.tokenStream(Analyzer.java:198) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46] at org.apache.lucene.document.Field.tokenStream(Field.java:574) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46] at org.apache.lucene.index.DefaultIndexingChain$PerField.invert(DefaultIndexingChain.java:740) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46] at org.apache.lucene.index.DefaultIndexingChain.processField(DefaultIndexingChain.java:447) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46] at org.apache.lucene.index.DefaultIndexingChain.processDocument(DefaultIndexingChain.java:403) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46] at org.apache.lucene.index.DocumentsWriterPerThread.updateDocument(DocumentsWriterPerThread.java:232) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46] at org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:478) ~[lucene-core-6.6.0.jar:6.6.0 5c7a7b65d2aa7ce5ec96458315c661a18b320241 - ishan - 2017-05-30 07:29:46] ``` If I understand well, there is one missing class possibly called "Cjk", but I do not understand why since the plugins are loaded and it can be noticed, either in the logs or using the "GET \_cat/plugins" command. (I installed them using the elasticsearch-plugin command) I eventually tried to copy the jar files in the lib directory, but this only created a Jar Hell, and I had to remove them, meaning they were already found, recognized and loaded. In case it can help, here is the configuration of the faulty index : ```auto [root@bulgaricn-mag2-dev-ss1 bin]# curl -X GET "localhost:9200/magento2_product_2_v1/_settings?pretty" { "magento2_product_2_v1" : { "settings" : { "index" : { "mapping" : { "total_fields" : { "limit" : "3000" } }, "number_of_shards" : "5", "provided_name" : "magento2_product_2_v1", "creation_date" : "1615801921169", "analysis" : { "filter" : { "default_stemmer" : { "type" : "stemmer", "language" : "cjk" }, "unique_stem" : { "type" : "unique", "only_on_same_position" : "true" } }, "char_filter" : { "default_char_filter" : { "type" : "html_strip" } }, "analyzer" : { "default" : { "filter" : [ "lowercase", "keyword_repeat", "default_stemmer", "unique_stem" ], "char_filter" : [ "default_char_filter" ], "type" : "custom", "tokenizer" : "default_tokenizer" } }, "tokenizer" : { "default_tokenizer" : { "type" : "standard" } } }, "number_of_replicas" : "1", "uuid" : "rmNwcq49Rv-yvFV_PIjhDg", "version" : { "created" : "5050399" } } } } } ``` I would really appreciate a hand in this matter, since I already spent more than 3 days on it. Looking forward reading you. Olivier ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [April 12, 2021, 12:00pm UTC](https://discuss.elastic.co/t/issue-about-invalid-stemmer-class-specified-cjk/267254/2 "2021-04-12T12:00:02Z")
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