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87f3579125
This adds a dedicated field mapper that supports nanosecond resolution - at the price of a reduced date range. When using the date field mapper, the time is stored as milliseconds since the epoch in a long in lucene. This field mapper stores the time in nanoseconds since the epoch - which means its range is much smaller, ranging roughly from 1970 to 2262. Note that aggregations will still be in milliseconds. However docvalue fields will have full nanosecond resolution Relates #27330