429 lines
8.9 KiB
Plaintext
429 lines
8.9 KiB
Plaintext
[[analysis-smartcn]]
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=== Smart Chinese Analysis Plugin
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The Smart Chinese Analysis plugin integrates Lucene's Smart Chinese analysis
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module into elasticsearch.
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It provides an analyzer for Chinese or mixed Chinese-English text. This
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analyzer uses probabilistic knowledge to find the optimal word segmentation
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for Simplified Chinese text. The text is first broken into sentences, then
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each sentence is segmented into words.
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:plugin_name: analysis-smartcn
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include::install_remove.asciidoc[]
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[[analysis-smartcn-tokenizer]]
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[float]
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==== `smartcn` tokenizer and token filter
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The plugin provides the `smartcn` analyzer, `smartcn_tokenizer` tokenizer, and
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`smartcn_stop` token filter which are not configurable.
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NOTE: The `smartcn_word` token filter and `smartcn_sentence` have been deprecated.
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==== Reimplementing and extending the analyzers
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The `smartcn` analyzer could be reimplemented as a `custom` analyzer that can
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then be extended and configured as follows:
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[source,console]
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----------------------------------------------------
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PUT smartcn_example
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{
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"settings": {
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"analysis": {
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"analyzer": {
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"rebuilt_smartcn": {
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"tokenizer": "smartcn_tokenizer",
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"filter": [
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"porter_stem",
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"smartcn_stop"
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]
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}
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}
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}
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}
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}
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----------------------------------------------------
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// TEST[s/\n$/\nstartyaml\n - compare_analyzers: {index: smartcn_example, first: smartcn, second: rebuilt_smartcn}\nendyaml\n/]
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[[analysis-smartcn_stop]]
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==== `smartcn_stop` token filter
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The `smartcn_stop` token filter filters out stopwords defined by `smartcn`
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analyzer (`_smartcn_`), and any other custom stopwords specified by the user.
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This filter only supports the predefined `_smartcn_` stopwords list.
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If you want to use a different predefined list, then use the
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{ref}/analysis-stop-tokenfilter.html[`stop` token filter] instead.
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[source,console]
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--------------------------------------------------
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PUT smartcn_example
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{
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"settings": {
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"index": {
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"analysis": {
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"analyzer": {
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"smartcn_with_stop": {
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"tokenizer": "smartcn_tokenizer",
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"filter": [
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"porter_stem",
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"my_smartcn_stop"
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]
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}
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},
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"filter": {
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"my_smartcn_stop": {
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"type": "smartcn_stop",
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"stopwords": [
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"_smartcn_",
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"stack",
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"的"
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]
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}
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}
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}
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}
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}
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}
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GET smartcn_example/_analyze
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{
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"analyzer": "smartcn_with_stop",
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"text": "哈喽，我们是 Elastic 我们是 Elastic Stack（Elasticsearch、Kibana、Beats 和 Logstash）的开发公司。从股票行情到 Twitter 消息流，从 Apache 日志到 WordPress 博文，我们可以帮助人们体验搜索的强大力量，帮助他们以截然不同的方式探索和分析数据"
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}
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--------------------------------------------------
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The above request returns:
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[source,console-result]
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--------------------------------------------------
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{
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"tokens": [
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{
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"token": "哈",
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"start_offset": 0,
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"end_offset": 1,
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"type": "word",
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"position": 0
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},
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{
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"token": "喽",
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"start_offset": 1,
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"end_offset": 2,
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"type": "word",
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"position": 1
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},
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{
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"token": "我们",
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"start_offset": 3,
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"end_offset": 5,
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"type": "word",
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"position": 3
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},
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{
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"token": "是",
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"start_offset": 5,
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"end_offset": 6,
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"type": "word",
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"position": 4
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},
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{
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"token": "elast",
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"start_offset": 7,
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"end_offset": 14,
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"type": "word",
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"position": 5
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},
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{
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"token": "我们",
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"start_offset": 17,
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"end_offset": 19,
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"type": "word",
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"position": 6
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},
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{
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"token": "是",
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"start_offset": 19,
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"end_offset": 20,
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"type": "word",
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"position": 7
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},
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{
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"token": "elast",
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"start_offset": 21,
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"end_offset": 28,
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"type": "word",
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"position": 8
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},
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{
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"token": "elasticsearch",
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"start_offset": 35,
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"end_offset": 48,
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"type": "word",
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"position": 11
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},
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{
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"token": "kibana",
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"start_offset": 49,
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"end_offset": 55,
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"type": "word",
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"position": 13
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},
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{
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"token": "beat",
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"start_offset": 56,
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"end_offset": 61,
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"type": "word",
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"position": 15
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},
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{
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"token": "和",
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"start_offset": 62,
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"end_offset": 63,
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"type": "word",
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"position": 16
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},
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{
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"token": "logstash",
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"start_offset": 64,
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"end_offset": 72,
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"type": "word",
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"position": 17
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},
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{
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"token": "开发",
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"start_offset": 74,
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"end_offset": 76,
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"type": "word",
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"position": 20
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},
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{
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"token": "公司",
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"start_offset": 76,
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"end_offset": 78,
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"type": "word",
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"position": 21
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},
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{
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"token": "从",
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"start_offset": 79,
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"end_offset": 80,
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"type": "word",
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"position": 23
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},
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{
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"token": "股票",
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"start_offset": 80,
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"end_offset": 82,
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"type": "word",
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"position": 24
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},
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{
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"token": "行情",
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"start_offset": 82,
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"end_offset": 84,
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"type": "word",
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"position": 25
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},
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{
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"token": "到",
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"start_offset": 84,
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"end_offset": 85,
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"type": "word",
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"position": 26
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},
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{
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"token": "twitter",
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"start_offset": 86,
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"end_offset": 93,
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"type": "word",
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"position": 27
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},
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{
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"token": "消息",
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"start_offset": 94,
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"end_offset": 96,
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"type": "word",
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"position": 28
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},
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{
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"token": "流",
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"start_offset": 96,
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"end_offset": 97,
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"type": "word",
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"position": 29
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},
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{
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"token": "从",
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"start_offset": 98,
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"end_offset": 99,
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"type": "word",
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"position": 31
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},
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{
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"token": "apach",
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"start_offset": 100,
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"end_offset": 106,
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"type": "word",
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"position": 32
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},
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{
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"token": "日志",
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"start_offset": 107,
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"end_offset": 109,
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"type": "word",
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"position": 33
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},
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{
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"token": "到",
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"start_offset": 109,
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"end_offset": 110,
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"type": "word",
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"position": 34
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},
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{
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"token": "wordpress",
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"start_offset": 111,
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"end_offset": 120,
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"type": "word",
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"position": 35
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},
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{
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"token": "博",
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"start_offset": 121,
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"end_offset": 122,
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"type": "word",
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"position": 36
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},
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{
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"token": "文",
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"start_offset": 122,
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"end_offset": 123,
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"type": "word",
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"position": 37
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},
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{
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"token": "我们",
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"start_offset": 124,
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"end_offset": 126,
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"type": "word",
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"position": 39
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},
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{
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"token": "可以",
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"start_offset": 126,
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"end_offset": 128,
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"type": "word",
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"position": 40
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},
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{
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"token": "帮助",
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"start_offset": 128,
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"end_offset": 130,
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"type": "word",
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"position": 41
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},
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{
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"token": "人们",
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"start_offset": 130,
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"end_offset": 132,
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"type": "word",
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"position": 42
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},
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{
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"token": "体验",
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"start_offset": 132,
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"end_offset": 134,
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"type": "word",
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"position": 43
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},
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{
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"token": "搜索",
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"start_offset": 134,
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"end_offset": 136,
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"type": "word",
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"position": 44
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},
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{
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"token": "强大",
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"start_offset": 137,
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"end_offset": 139,
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"type": "word",
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"position": 46
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},
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{
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"token": "力量",
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"start_offset": 139,
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"end_offset": 141,
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"type": "word",
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"position": 47
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},
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{
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"token": "帮助",
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"start_offset": 142,
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"end_offset": 144,
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"type": "word",
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"position": 49
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},
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{
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"token": "他们",
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"start_offset": 144,
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"end_offset": 146,
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"type": "word",
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"position": 50
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},
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{
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"token": "以",
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"start_offset": 146,
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"end_offset": 147,
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"type": "word",
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"position": 51
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},
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{
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"token": "截然不同",
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"start_offset": 147,
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"end_offset": 151,
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"type": "word",
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"position": 52
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},
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{
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"token": "方式",
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"start_offset": 152,
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"end_offset": 154,
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"type": "word",
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"position": 54
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},
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{
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"token": "探索",
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"start_offset": 154,
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"end_offset": 156,
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"type": "word",
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"position": 55
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},
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{
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"token": "和",
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"start_offset": 156,
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"end_offset": 157,
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"type": "word",
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"position": 56
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},
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{
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"token": "分析",
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"start_offset": 157,
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"end_offset": 159,
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"type": "word",
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"position": 57
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},
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{
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"token": "数据",
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"start_offset": 159,
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"end_offset": 161,
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"type": "word",
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"position": 58
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}
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]
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}
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--------------------------------------------------
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