NPE when doing fuzzy (tested on empty and filed index)

npe-fuzzy.sh

curl -XDELETE http://localhost:9200/npefuzzy

curl -XPUT http://localhost:9200/npefuzzy?pretty -d '{
  "settings" : { "index" : { "number_of_shards" : 1, "number_of_replicas" : 0 }}
}'

curl -XPUT http://localhost:9200/npefuzzy/beer/1?pretty -d '{
   "brand":"Grimbergen",
   "colour":"PALE",
   "size":1.3476184461445255,
   "price":7.318647685097387,
   "date":1320090719440
}'

curl -XPOST "localhost:9200/npefuzzy/_refresh?pretty"

# This one is OK
curl -XPOST http://localhost:9200/npefuzzy/beer/_search?pretty -d '
{"query":{
  "flt" : {
    "fields" : [ "brand", "colour" ],
    "like_text" : "heineken is a pale beer",
    "max_query_terms" : 12
  }
}}'

# This one was ok (no error) in 0.20 (Lucene 3) but fails with 0.21 (Lucene 4)
curl -XPOST http://localhost:9200/npefuzzy/beer/_search?pretty -d '
{"query":{
  "flt" : {
    "fields" : [ "brand", "nonexistingfield" ],
    "like_text" : "heineken is a pale beer",
    "max_query_terms" : 12
  }
}}'