Elasticsearch Dynamic Templates not working with Nested Documents - elasticsearch

Question

I Really thought I had this working, but I'm actually having issues. I have a dynamic template set up to match nested documents. I set up my mappings like so:
curl -XPUT 'http://localhost:9200/test/' -d '{
"mappings": {
"Item": {
"dynamic_templates": [
{
"metadata_template": {
"match_mapping_type": "string",
"path_match": "metadata.*",
"mapping": {
"type": "multi_field",
"fields": {
"{name}": {
"type": "{dynamic_type}",
"index": "analyzed"
},
"standard": {
"type": "{dynamic_type}",
"index": "analyzed",
"analyzer" : "standard"
}
}
}
}
}
]
}
},
"settings": {
"analysis": {
"filter": {
"my_ngram": {
"max_gram": 10,
"min_gram": 1,
"type": "nGram"
},
"lb_stemmer": {
"type": "stemmer",
"name": "english"
}
},
"analyzer": {
"default_index": {
"filter": [
"standard",
"lowercase",
"asciifolding",
"my_ngram"
],
"type": "custom",
"tokenizer": "keyword"
},
"default_search": {
"filter": [
"standard",
"lowercase"
],
"type": "custom",
"tokenizer": "standard"
}
}
}
}
}'
My expectation is that all fields that start with "metadata." should be stored in an analyzed field and in an unanalyzed field with the suffix ".standard". Am I completely misunderstanding this?
I add an item:
curl -XPUT localhost:9200/test/Item/1 -d '{
"name" : "test",
"metadata" : {
"strange_tag" : "CLEAN_2C_abcdefghij_07MAY2005_AB"
}
}'
This query works great:
{
"query": {
"match": {
"metadata.strange_tag": {
"query": "CLEAN_2C_abcdefghij_07MAY2005_AB",
"type": "boolean"
}
}
}
}
But the searching for the word CLEAN, or clean doesn't return any results. I expect that field to have gone through the ngram tokenizer. Anyone have a suggestion for what I'm doing wrong?

Answer 1

Looks l like I was incorrectly creating my NGRAM analyzer. Here is a working example:
curl -XDELETE 'localhost:9200/test'
curl -XPUT 'localhost:9200/test' -d '{
"settings": {
"analysis": {
"analyzer": {
"my_ngram_analyzer": {
"tokenizer": "my_ngram_tokenizer",
"filter": [
"standard",
"lowercase",
"asciifolding"
]
}
},
"tokenizer": {
"my_ngram_tokenizer": {
"type": "nGram",
"min_gram": "2",
"max_gram": "3",
"token_chars": [
"letter",
"digit"
]
}
}
}
},
"mappings": {
"Item": {
"dynamic_templates": [
{
"metadata_template": {
"match_mapping_type": "string",
"path_match": "*",
"mapping": {
"type": "multi_field",
"fields": {
"{name}": {
"type": "{dynamic_type}",
"index": "analyzed",
"analyzer" : "my_ngram_analyzer"
},
"standard": {
"type": "{dynamic_type}",
"index": "analyzed",
"analyzer": "standard"
}
}
}
}
}
]
}
}
}'