Elastic search double words in suggestions

If I trying to get suggestions for phrase using this query

POST _search
{
"suggest":{
"my-suggest-1" : {
"text" : "täta tack",
"phrase" : {
"field" : "fieldName"
}
}
}
}

I get response with double words in suggestions

"suggest": {
"my-suggest-1": [
{
"text": "täta tack",
"offset": 0,
"length": 9,
"options": [
{
"text": "tält tack tack",
"score": 0.000005947221
},
{
"text": "tätt tack tack",
"score": 0.0000057828424
},
{
"text": "tät tack tack",
"score": 0.000003946186
},
{
"text": "tvätt tack tack",
"score": 0.0000038843486
},
{
"text": "tända tack tack",
"score": 0.0000034827103
}
]
}
]
}

Looks like "täta"->"tält tack", "tack"->"tack" = "tält tack tack".

How can I fix it?

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