MinHash Plugin provides b-bit MinHash algorism for Elasticsearch. Using a field type and a token filter provided by this plugin, you can add a minhash value to your document.
| Taste | Elasticsearch |
|---|---|
| master | 1.3.X |
Please file an issue. (Japanese forum is here.)
(TBD: not released yet...)
$ $ES_HOME/bin/plugin --install org.codelibs/elasticsearch-minhash/1.3.0
First, you need to add a minhash analyzer when creating your index:
$ curl -XPUT 'localhost:9200/my_index' -d '{
"index":{
"analysis":{
"analyzer":{
"minhash_analyzer":{
"type":"custom",
"tokenizer":"standard",
"filter":["minhash"]
}
}
}
}
}'
You can feel free to change tokenizer/char_filter/filter settings, but minhash filter needs to be added as a last filter.
Put minhash field into an index mapipng:
$ curl -XPUT "localhost:9200/my_index/my_type/_mapping" -d '{
"my_type":{
"properties":{
"message":{
"type":"string",
"copy_to":"minhash_value"
},
"minhash_value":{
"type":"minhash",
"minhash_analyzer":"minhash_analyzer"
}
}
}
}'
The field type of minhash is a binary type. The above example is to calculate a minhash value of message field and store it to minhash_value field.
Add the following document:
$ curl -XPUT "localhost:9200/my_index/my_type/1" -d '{
"message":"Fess is Java based full text search server provided as OSS product."
}'
The minhash value is calculated automatically when adding the document. You can check it as below:
$ curl -XGET "localhost:9200/my_index/my_type/1?pretty&fields=minhash_value,_source"
{
"_index" : "my_index",
"_type" : "my_type",
"_id" : "1",
"_version" : 1,
"found" : true,
"_source":{
"message":"Fess is Java based full text search server provided as OSS product."
},
"fields" : {
"minhash_value" : [ "KV5rsUfZpcZdVojpG8mHLA==" ]
}
}