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Stemmer Override Token Filter

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Stemmer Override Token Filter

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Overrides stemming algorithms, by applying a custom mapping, then protecting these terms from being modified by stemmers. Must be placed before any stemming filters.

Rules are separated by =>

Setting	Description
`rules`	A list of mapping rules to use.
`rules_path`	A path (either relative to `config` location, or absolute) to a list of mappings.

Here is an example:

index :
    analysis :
        analyzer :
            myAnalyzer :
                type : custom
                tokenizer : standard
                filter : [lowercase, custom_stems, porter_stem]
        filter:
            custom_stems:
                type: stemmer_override
                rules_path : analysis/custom_stems.txt

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