The IK Analysis plugin brings advanced text analysis capabilities to your Elasticsearch and OpenSearch installations. By integrating the Lucene IK analyzer, it allows for customized dictionaries and supports multiple analyzers and tokenizers. In this guide, we’ll walk through the installation process, how to get started with the plugin, and some troubleshooting tips.

Table of Contents

• Installation
• Getting Started
• Dictionary Configuration
• Hot-reload Dictionary
• FAQs
• Troubleshooting

Installation

You can install the IK Analysis plugin in a couple of ways:

• Download the packaged plugins from here.
• Use the plugin CLI commands as follows:

For Elasticsearch:
bin/elasticsearch-plugin install https://get.infini.cloud/elasticsearch/analysis-ik-8.4.1

For OpenSearch:
bin/opensearch-plugin install https://get.infini.cloud/opensearch/analysis-ik-2.12.0

Make sure to replace the version number with the one relevant to your Elasticsearch or OpenSearch installation.

Getting Started

Once installed, you can start using the IK Analysis plugin with the following steps:

1. Create an index:

curl -XPUT http://localhost:9200/index

2. Define a mapping:

curl -XPOST http://localhost:9200/index/_mapping -H 'Content-Type: application/json' -d '{
        "properties": {
            "content": {
                "type": "text",
                "analyzer": "ik_max_word",
                "search_analyzer": "ik_smart"
            }
        }
    }'

3. Index some documents:

curl -XPOST http://localhost:9200/index/_create/1 -H 'Content-Type: application/json' -d '{"content": "example content"}'

Repeat the indexing command for the other documents you want to add to your index.

Dictionary Configuration

The IK Analysis plugin allows for custom dictionary configuration. You can find the configuration file at:

• conf/analysis-ik/config/IKAnalyzer.cfg.xml
• plugins/elasticsearch-analysis-ik-*/config/IKAnalyzer.cfg.xml

Example contents of the configuration file may look like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
    <entry key="ext_dict">custom/mydict.dic;custom/single_word_low_freq.dic</entry>
    <entry key="ext_stopwords">custom/ext_stopword.dic</entry>
    <entry key="remote_ext_dict">http://xxx.com/xxx.dic</entry>
    <entry key="remote_ext_stopwords">http://xxx.com/xxx.dic</entry>
</properties>

Hot-reload Dictionary

The hot-reload feature allows the plugin to fetch new words from a remote file without restarting your Elasticsearch instance. To enable this feature, ensure that:

• The HTTP request returns the headers Last-Modified and ETag.
• The content format of the returned file is one word per line.

Keep your words in a UTF-8 encoded .txt file hosted on an HTTP server like Nginx, and simply update the file as needed.

FAQs

Here are some frequently asked questions regarding the IK Analysis plugin:

• Why isn’t the custom dictionary taking effect?

  Please ensure that your custom dictionary is UTF-8 encoded.

• What is the difference between ik_max_word and ik_smart?

  ik_max_word performs a more granular segmentation, while ik_smart segments text coarsely, suitable for different query types.

Troubleshooting

If you encounter issues while using the IK Analysis plugin, consider the following troubleshooting tips:

• Ensure that you have the correct version of Elasticsearch or OpenSearch installed.
• Double-check your JSON formats during document indexing to avoid syntax errors.
• Verify that your custom dictionary is properly formatted and accessible.

If the problem persists, you can reach out for help or gather more information by visiting fxis.ai.

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