Multi field type mapping

i have mapped multi field for an index like this
"tweet" : {
"properties" : {
"name" : {
"type" : "multi_field",
"fields" : {
"name" : {"type" : "string", "index" :
"untouched" : {"type" : "string", "index" :

and indexing data's to this index. i want add one more field as
multifield. i added using ignore conflicts. the field also added. but
when i search the records with that specfic fields no data found.
error raised. the error is no mapping found for that specfic field.

Note: if i add as single field after indexing. its working.

pls help me.

Thanks & Regards