Kuromoji analyzer default character/token filters

Luke3113 · December 5, 2016, 3:21am

Hi I'm using Elasticsearch 5.0.1 with the Kuromoji plugin.
Until now I've merely used its default configuration by using the following mapping:

"analyzer": "kuromoji"

However as stated in the docs (Kuromoji analyzer) it consists of a character filter, tokenizer and various token filters. Some of these seem to be applied in the analyzer's default settings (e.g. kuromoji_baseform), some not (e.g. kuromoji_number token filter).

I would like to know which filters are being used in Kuromojis default setting. Is there any way to find out with an API-call?
I've tried looking into the Plugin-sources as this doesn't seem to be documented: KuromojiAnalyzerProvider.java
However, there doesn't seem to be any character-filters or tokenizers defined.

Thank you!

dadoonet · December 5, 2016, 5:18am

May be look here:

github.com

apache/lucene-solr/blob/master/lucene/analysis/kuromoji/src/java/org/apache/lucene/analysis/ja/JapaneseAnalyzer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.lucene.analysis.ja;


import java.io.IOException;

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Luke3113 · December 5, 2016, 7:29am

Oh great thanks, I didn't know the JapaneseAnalyzer is also part of Kuromoji!
So it seems from this file that following components are used by default:

kuromoji_tokenizer - tokenizer
kuromoji_baseform - token filter
kuromoji_part_of_speech - token filter
cjk_width - token filter
ja_stop - token filter
kuromoji_stemmer - token filter
lowercase - token filter

Doesn't seem to be used by default:

kuromoji_iteration_mark - character filter
kuromoji_number - token filter
kuromoji_readingform - token filter

johtani · December 5, 2016, 8:03am

And additional information, stoptags and stopwords are here.

https://github.com/apache/lucene-solr/tree/master/lucene/analysis/kuromoji/src/resources/org/apache/lucene/analysis/ja

system · January 2, 2017, 8:03am

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