EdgeNgram Boosting more than Synonum

Hi ,

I have the following entry in my synonym properties

YU,Yeshiva University,Yale University

my college name field has the following mapping

"autocomplete_search":{
"type":"custom",
"tokenizer":"whitespace",
"filter":[
"lowercase",
"syns_filter"
]
},
"autocomplete_index":{
"type":"custom",
"tokenizer":"whitespace",
"filter":[
"lowercase",
"syns_filter",
"my_edgeNgram"
]
}

When i query

{
"fields": [
"name"
],
"query": {
"match": {
"name": {
"query": "YU"
}
}
}
}

my results are as below:

"name": "Yuba College"
"name": "Yukon Beauty College"
"name": "Yale University"
"name": "Cambridge Junior College - Yuba City"

Tough "Yale University" matched completely from synonums still the other
two results are higher up which matched "YU" why?

-paul

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