elasticsearchHow do I use an Elasticsearch analyzer?
An Elasticsearch analyzer is a combination of one tokenizer and zero or more token filters that are used to break a string down into tokens.
To use an analyzer, you can define a custom analyzer in the mapping of an index, or use one of the built-in analyzers.
For example, to create a custom analyzer with a whitespace tokenizer and lowercase filter, you can use the following code:
PUT my_index
{
"settings": {
"analysis": {
"analyzer": {
"my_analyzer": {
"type": "custom",
"tokenizer": "whitespace",
"filter": [
"lowercase"
]
}
}
}
}
}
The output of the above code is:
{
"acknowledged": true,
"shards_acknowledged": true,
"index": "my_index"
}
To use the analyzer, you can use the analyze API to test the analyzer:
GET my_index/_analyze
{
"analyzer": "my_analyzer",
"text": "This is a Test"
}
The output of the above code is:
{
"tokens": [
{
"token": "this",
"start_offset": 0,
"end_offset": 4,
"type": "<ALPHANUM>",
"position": 0
},
{
"token": "is",
"start_offset": 5,
"end_offset": 7,
"type": "<ALPHANUM>",
"position": 1
},
{
"token": "a",
"start_offset": 8,
"end_offset": 9,
"type": "<ALPHANUM>",
"position": 2
},
{
"token": "test",
"start_offset": 10,
"end_offset": 14,
"type": "<ALPHANUM>",
"position": 3
}
]
}
The above example shows how to use an Elasticsearch analyzer.
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