ElasticSearch n-gram tokenfilter not finding partial words

Not sure about the default_* settings.But applying a mapping that specifies index_analyzer and search_analyzer works:

curl -XDELETE localhost:9200/twittercurl -XPOST localhost:9200/twitter -d '{"index":   { "number_of_shards": 1,    "analysis": {       "filter": {                  "mynGram" : {"type": "nGram", "min_gram": 2, "max_gram": 10}                 },       "analyzer": { "a1" : {                    "type":"custom",                    "tokenizer": "standard",                    "filter": ["lowercase", "mynGram"]                    }                  }      }  }}}'curl -XPUT localhost:9200/twitter/tweet/_mapping -d '{    "tweet" : {        "index_analyzer" : "a1",        "search_analyzer" : "standard",         "date_formats" : ["yyyy-MM-dd", "dd-MM-yyyy"],        "properties" : {            "user": {"type":"string", "analyzer":"standard"},            "message" : {"type" : "string" }        }    }}'curl -XPUT 'http://localhost:9200/twitter/tweet/1' -d '{    "user" : "kimchy",    "post_date" : "2009-11-15T14:12:12",    "message" : "trying out Elastic Search"}'curl -XGET localhost:9200/twitter/_search?q=earcurl -XGET localhost:9200/twitter/_search?q=seacurl -XGET localhost:9200/twitter/_mapping

You should check the get mapping API to see if your mapping has been applied:http://www.elasticsearch.org/guide/reference/api/admin-indices-get-mapping.html

Btw it has been said on the mailing list that when an index already contains documents, the mappings you put on the elasticsearch.yml are not applied. You need to clean your index first.

I've tried ngrams with ES and it works fine for me.