elasticsearch/docs/reference/migration/migrate_8_0/mappings.asciidoc

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[[breaking_80_mappings_changes]]
=== Mapping changes
//NOTE: The notable-breaking-changes tagged regions are re-used in the
//Installation and Upgrade Guide
//tag::notable-breaking-changes[]
// end::notable-breaking-changes[]
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==== Limiting the number of completion contexts
The number of completion contexts within a single completion field
has been limited to 10.
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==== Defining multi-fields within multi-fields
Previously, it was possible to define a multi-field within a multi-field.
Defining chained multi-fields was deprecated in 7.3 and is now no longer
supported. To migrate the mappings, all instances of `fields` that occur within
a `fields` block should be removed, either by flattening the chained `fields`
blocks into a single level, or by switching to `copy_to` if appropriate.