Failure to decompound Wandhalter

[felixbarny]

The term Wandhalterung is split to the tokens wand, alterung instead of wand, halterung. When setting the threshold to 0.63 or higher, the tokens are wandh and alterung. What can I do to fix this?

These are my settings:

index :
    analysis :
        analyzer :
            analyzer_decomp :
                type : custom
                tokenizer : standard
                filter : [lowercase, decomp]
        filter :
            decomp:
                type: decompound
        tokenizer:
            decomp:
                type: standard
                filter:
                  - decomp

I'm using Elasticsearch 2.1.1 and elasticsearch-analysis-decompound 2.1.1.0

[felixbarny]

Interestingly, this problem only appears when the word has the ung suffix. When analyzing Wandhalter everything works as expected.

[felixbarny]

I kind of solved this by applying a stemmer before and after the decomp filter:

index :
    analysis :
        analyzer :
            analyzer_decomp :
                type : custom
                tokenizer : standard
                filter : [lowercase, snow_de, decomp, snow_de]
        filter :
            decomp:
                type: decompound
            snow_de :
                type : snowball
                language : German2
        tokenizer:
            decomp:
                type: standard
                filter:
                  - decomp