ElasticSearch edgeNGram - elasticsearch

Question

I have the following settings and analyzer:
put /tests
{
"settings": {
"analysis": {
"analyzer": {
"standardWithEdgeNGram": {
"tokenizer": "standard",
"filter": ["lowercase", "edgeNGram"]
}
},
"tokenizer": {
"standard": {
"type": "standard"
}
},
"filter": {
"lowercase": {
"type": "lowercase"
},
"edgeNGram": {
"type": "edgeNGram",
"min_gram": 2,
"max_gram": 15,
"token_chars": ["letter", "digit"]
}
}
}
},
"mappings": {
"test": {
"_all": {
"analyzer": "standardWithEdgeNGram"
},
"properties": {
"Name": {
"type": "string",
"analyzer": "standardWithEdgeNGram"
}
}
}
}
}
And I posted the following data into it:
POST /tests/test
{
"Name": "JACKSON v. FRENKEL"
}
And here is my query:
GET /tests/test/_search
{
"query": {
"match": {
"Name": "jax"
}
}
}
And I got this result:
{
"took": 2,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 0.19178301,
"hits": [
{
"_index": "tests",
"_type": "test",
"_id": "lfOxb_5bS86_CMumo_ZLoA",
"_score": 0.19178301,
"_source": {
"Name": "JACKSON v. FRENKEL"
}
}
]
}
}
Can someone explain to me that there is no "jax" anywhere in the "Name", and it still gets the match?
Thanks in advance

Answer 1

A match query performs analysis on its given value. By default, "jax" is being analyzed with standardWithEdgeNGram, which includes n-gram analysis permuting it into ["ja", "ax"], the first of which matches the "ja" from the analyzed "JACKSON v. FRENKEL".
If you don't want this behavior you can specify a different analyzer to match, using the analyzer field, for example keyword:
GET /tests/test/_search
{
"query": {
"match": {
"Name": "jax",
"analyzer" : "keyword"
}
}
}

Answer 2

In ES 1.3.2 the below query gave an error
GET /tests/test/_search
{
"query": {
"match": {
"Name": "jax",
"analyzer" : "keyword"
}
}
}
Error : query parsed in simplified form, with direct field name, but included more options than just the field name, possibly use its 'options' form, with 'query' element?]; }]
status: 400
I fixed the issue as below:
{
"query": {
"query_string": {
"fields": [
"Name"
],
"query": "jax",
"analyzer": "simple"
}
}
}