{
    "index":{
        "analysis":{
            "filter":{
                "shingle_inverse":{
                    "type":"shingle",
                    "max_shingle_size" : 3,
                    "min_shingle_size" : 3,
                    "output_unigrams" : false,
                    "output_unigrams_if_no_shingles" : true,
                    "token_separator" : "_"
                },
                "shingle_filler":{
                    "type":"shingle",
                    "max_shingle_size" : 3,
                    "min_shingle_size" : 2,
                    "output_unigrams" : false,
                    "filler_token" : "FILLER"
                }
            }            
        }
    }
}