Autocompletion with whitespace tokenizer in elasticsearch. Tokenize whitespaces correctly - elasticsearch

Question

I have an elastic index I want to do autocompletion with.
Therfore i have a suggestField of type completion where i put text that should be autocompleted.
"suggestField" : {
"type" : "completion",
"analyzer" : "IndexAnalyzer",
"search_analyzer" : "SearchAnalyzer",
"preserve_separators" : true,
"preserve_position_increments" : true,
"max_input_length" : 50
},
With Analyzers:
"IndexAnalyzer" : {
"filter" : [
"lowercase",
"stop",
"stopGerman",
"EdgeNGramFilter"
],
"type" : "custom",
"tokenizer" : "MyTokenizer"
},
"SearchAnalyzer" : {
"filter" : [
"lowercase"
],
"type" : "custom",
"tokenizer" : "MyTokenizer"
},
Filters and Tokenizer:
"filter" : {
"EdgeNGramFilter" : {
"type" : "edge_ngram",
"min_gram" : "1",
"max_gram" : "50"
},
"stopGerman" : {
"type" : "stop",
"stopwords" : "_german_"
}
},
"tokenizer" : {
"MyTokenizer" : {
"type" : "whitespace"
}
}
My Problem is now that if i query that field the autocompletion only works if i start at the beginning of the text, not for every word.
E.g. i have one value in my suggest field that looks like: "123-456-789 thisisatest"
If i search my suggest field for 123- i get that value as a result.
But if i search for thisis id do not get a result.
This is my Query.
POST myindex/_search?typed_keys=true
{
"suggest": {
"completion-term": {
"completion" : {
"field" : "suggestField"
} ,
"prefix" : "thisis"
}
}
}
The Question: How do I have to change the above setup to get the given value as a result if i search for thisis ?
FYI: If I use the IndexAnalyzer in kibana with an _analyze query for 123-456-789 thisisatest i get the (from my point of view correct) tokens:
1
12
123
123-
123-4
123-45
123-456
123-456-7
123-456-78
123-456-789
t
th
thi
this
thisi
thisis
thisisa
thisisat
thisisate
thisisates
thisisatest