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Range aggregation tests were failing (e.g. http://build-us-00.elastic.co/job/es_core_master_metal/12385/testReport/junit/org.elasticsearch.messy.tests/IPv4RangeTests/testPartiallyUnmapped/) sometimes because both the string and number versions of form and to were being serialised. This meant that the range aggregator builder objects would not serialise and deserialise to the same bytes before and after the builder had been used. This change makes Range object immutable so the builder doesn't need to worry about the range changing under its feet.