55 lines
1.8 KiB
Plaintext
55 lines
1.8 KiB
Plaintext
[float]
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[[breaking_70_mappings_changes]]
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=== Mapping changes
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[float]
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==== The `_all` meta field is removed
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The `_all` field deprecated in 6 have now been removed.
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[float]
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==== The `_uid` meta field is removed
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This field used to index a composite key formed of the `_type` and the `_id`.
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Now that indices cannot have multiple types, this has been removed in favour
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of `_id`.
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[float]
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==== The `_default_` mapping is no longer allowed
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The `_default_` mapping has been deprecated in 6.0 and is now no longer allowed
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in 7.0. Trying to configure a `_default_` mapping on 7.x indices will result in
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an error.
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[float]
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==== `index_options` for numeric fields has been removed
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The `index_options` field for numeric fields has been deprecated in 6 and has now been removed.
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[float]
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==== Limiting the number of `nested` json objects
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To safeguard against out of memory errors, the number of nested json objects within a single
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document across all fields has been limited to 10000. This default limit can be changed with
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the index setting `index.mapping.nested_objects.limit`.
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[float]
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==== The `update_all_types` option has been removed
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This option is useless now that all indices have at most one type.
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[float]
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==== The `classic` similarity has been removed
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The `classic` similarity relied on coordination factors for scoring to be good
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in presence of stopwords in the query. This feature has been removed from
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Lucene, which means that the `classic` similarity now produces scores of lower
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quality. It is advised to switch to `BM25` instead, which is widely accepted
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as a better alternative.
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[float]
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==== Similarities fail when unsupported options are provided
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An error will now be thrown when unknown configuration options are provided
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to similarities. Such unknown parameters were ignored before.
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