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a754224751
This adds the field data circuit breaker, which is used to estimate the amount of memory required to load field data before loading it. It then raises a CircuitBreakingException if the limit is exceeded. It is configured with two parameters: `indices.fielddata.cache.breaker.limit` - the maximum number of bytes of field data to be loaded before circuit breaking. Defaults to `indices.fielddata.cache.size` if set, unbounded otherwise. `indices.fielddata.cache.breaker.overhead` - a contast for all field data estimations to be multiplied with before aggregation. Defaults to 1.03. Both settings can be configured dynamically using the cluster update settings API.