ICU Analysis for ElasticSearch

The ICU Analysis plugin integrates Lucene ICU module into elasticsearch, adding ICU relates analysis components.

In order to install the plugin, simply run: bin/plugin -install elasticsearch/elasticsearch-analysis-icu/1.2.0.

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| ICU Analysis Plugin | ElasticSearch  |
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| master              | 0.19 -> master |
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| 1.2.0               | 0.19 -> master |
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| 1.1.0               | 0.18           |
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| 1.0.0               | 0.18           |
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ICU Normalization

Normalizes characters as explained "here":http://userguide.icu-project.org/transforms/normalization. It registers itself by default under @icu_normalizer@ or @icuNormalizer@ using the default settings. Allows for the name parameter to be provided which can include the following values: @nfc@, @nfkc@, and @nfkc_cf@. Here is a sample settings:

{
    "index" : {
        "analysis" : {
            "analyzer" : {
                "collation" : {
                    "tokenizer" : "keyword",
                    "filter" : ["icu_normalizer"]
                }
            }
        }
    }
}

ICU Folding

Folding of unicode characters based on @UTR#30@. It registers itself under @icu_folding@ and @icuFolding@ names. Sample setting:

{
    "index" : {
        "analysis" : {
            "analyzer" : {
                "collation" : {
                    "tokenizer" : "keyword",
                    "filter" : ["icu_folding"]
                }
            }
        }
    }
}

ICU Collation

Uses collation token filter. Allows to either specify the rules for collation (defined "here":http://www.icu-project.org/userguide/Collate_Customization.html) using the @rules@ parameter (can point to a location or expressed in the settings, location can be relative to config location), or using the @language@ parameter (further specialized by country and variant). By default registers under @icu_collation@ or @icuCollation@ and uses the default locale.

Here is a sample settings:

{
    "index" : {
        "analysis" : {
            "analyzer" : {
                "collation" : {
                    "tokenizer" : "keyword",
                    "filter" : ["icu_collation"]
                }
            }
        }
    }
}

And here is a sample of custom collation:

{
    "index" : {
        "analysis" : {
            "analyzer" : {
                "collation" : {
                    "tokenizer" : "keyword",
                    "filter" : ["myCollator"]
                }
            },
            "filter" : {
                "myCollator" : {
                    "type" : "icu_collation",
                    "language" : "en"
                }
            }
        }
    }
}

ICU Tokenizer

Breaks text into words according to UAX #29: Unicode Text Segmentation ((http://www.unicode.org/reports/tr29/)).

{
    "index" : {
        "analysis" : {
            "analyzer" : {
                "collation" : {
                    "tokenizer" : "icu_tokenizer",
                }
            }
        }
    }
}