Elasticsearch not using "default_search" analyzer unless explicitly stated in query - elasticsearch

Question

From reading the Elasticsearch documents, I would expect that naming an analyzer 'default_search' would cause that analyzer to get used for all searches unless another analyzer is specified. However, if I define my index like so:
curl -XPUT 'http://localhost:9200/test/' -d '{
"settings": {
"analysis": {
"analyzer": {
"my_ngram_analyzer": {
"tokenizer": "my_ngram_tokenizer",
"filter": [
"lowercase"
],
"type" : "custom"
},
"default_search": {
"tokenizer" : "keyword",
"filter" : [
"lowercase"
]
}
},
"tokenizer": {
"my_ngram_tokenizer": {
"type": "nGram",
"min_gram": "3",
"max_gram": "100",
"token_chars": []
}
}
}
},
"mappings": {
"TestDocument": {
"dynamic_templates": [
{
"metadata_template": {
"match_mapping_type": "string",
"path_match": "*",
"mapping": {
"type": "multi_field",
"fields": {
"ngram": {
"type": "{dynamic_type}",
"index": "analyzed",
"analyzer": "my_ngram_analyzer"
},
"{name}": {
"type": "{dynamic_type}",
"index": "analyzed",
"analyzer": "standard"
}
}
}
}
}
]
}
}
}'
And then add a 'TestDocument':
curl -XPUT 'http://localhost:9200/test/TestDocument/1' -d '{
"name" : "TestDocument.pdf" }'
My queries are still running through the default analyzer. I can tell because this query gives me a hit:
curl -XGET 'localhost:9200/test/TestDocument/_search?pretty=true' -d '{
"query": {
"match": {
"name.ngram": {
"query": "abc.pdf"
}
}
}
}'
But does not if I specify the correct analyzer (using the 'keyword' tokenizer)
curl -XGET 'localhost:9200/test/TestDocument/_search?pretty=true' -d '{
"query": {
"match": {
"name.ngram": {
"query": "abc.pdf",
"analyzer" : "default_search"
}
}
}
}'
What am I missing to use "default_search" for searches unless stated otherwise in my query? Am I just misinterpreting expected behavior here?

Answer 1

In your dynamic template, you are setting the search and index analyzer by using "analyzer." It will only use the default as a last resort.
"index_analyzer":"analyzer_name" //sets the index analyzer
"analyzer":"analyzer_name" // sets both search and index
"search_analyzer":"...." // sets the search analyzer.