29 lines
1.3 KiB
Plaintext
29 lines
1.3 KiB
Plaintext
[[breaking_50_aggregations_changes]]
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=== Aggregation changes
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==== Significant terms on numeric fields
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Numeric fields have been refactored to use a different data structure that
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performs better for range queries. However, since this data structure does
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not record document frequencies, numeric fields need to fall back to running
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queries in order to estimate the number of matching documents in the
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background set, which may incur a performance degradation.
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It is recommended to use <<keyword,`keyword`>> fields instead, either directly
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or through a <<multi-fields,multi-field>> if the numeric representation is
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still needed for sorting, range queries or numeric aggregations like
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<<search-aggregations-metrics-stats-aggregation,`stats` aggregations>>.
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==== `ip_range` aggregations
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Now that Elasticsearch supports `ipv6`, `ip` addresses are encoded in the index
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using a binary representation rather than a numeric representation. As a
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consequence, the output of `ip_range` aggregations does not give numeric values
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for `from` and `to` anymore.
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==== `size: 0` on Terms, Significant Terms and Geohash Grid Aggregations
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`size: 0` is no longer valid for the terms, significant terms and geohash grid
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aggregations. Instead a size should be explicitly specified with a number greater
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than zero.
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