# `MappingIcuCollationProperty` [interface-MappingIcuCollationProperty]

| Name | Type | Description |
| - | - | - |
| `alternate` | [AnalysisIcuCollationAlternate](./AnalysisIcuCollationAlternate.md) |   |
| `case_first` | [AnalysisIcuCollationCaseFirst](./AnalysisIcuCollationCaseFirst.md) |   |
| `case_level` | boolean |   |
| `country` | string |   |
| `decomposition` | [AnalysisIcuCollationDecomposition](./AnalysisIcuCollationDecomposition.md) |   |
| `hiragana_quaternary_mode` | boolean |   |
| `index_options` | [MappingIndexOptions](./MappingIndexOptions.md) |   |
| `index` | boolean | Should the field be searchable? |
| `language` | string |   |
| `norms` | boolean |   |
| `null_value` | string | Accepts a string value which is substituted for any explicit null values. Defaults to null, which means the field is treated as missing. |
| `numeric` | boolean |   |
| `rules` | string |   |
| `strength` | [AnalysisIcuCollationStrength](./AnalysisIcuCollationStrength.md) |   |
| `type` | 'icu_collation_keyword' |   |
| `variable_top` | string |   |
| `variant` | string |   |