77 lines
2.6 KiB
Plaintext
77 lines
2.6 KiB
Plaintext
[[mapping-dynamic-mapping]]
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== Dynamic Mapping
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Default mappings allow generic mapping definitions to be automatically applied
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to types that do not have mappings predefined. This is mainly done
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thanks to the fact that the
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<<mapping-object-type,object mapping>> and
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namely the <<mapping-root-object-type,root
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object mapping>> allow for schema-less dynamic addition of unmapped
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fields.
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The default mapping definition is a plain mapping definition that is
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embedded within the distribution:
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[source,js]
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--------------------------------------------------
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{
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"_default_" : {
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}
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}
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--------------------------------------------------
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Pretty short, isn't it? Basically, everything is defaulted, especially the
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dynamic nature of the root object mapping. The default mapping
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definition can be overridden in several manners. The simplest manner is
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to simply define a file called `default-mapping.json` and to place it
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under the `config` directory (which can be configured to exist in a
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different location). It can also be explicitly set using the
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`index.mapper.default_mapping_location` setting.
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The dynamic creation of mappings for unmapped types can be completely
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disabled by setting `index.mapper.dynamic` to `false`.
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The dynamic creation of fields within a type can be completely
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disabled by setting the `dynamic` property of the type to `strict`.
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Here is a <<indices-put-mapping,Put Mapping>> example that
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disables dynamic field creation for a `tweet`:
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[source,js]
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--------------------------------------------------
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$ curl -XPUT 'http://localhost:9200/twitter/_mapping/tweet' -d '
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{
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"tweet" : {
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"dynamic": "strict",
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"properties" : {
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"message" : {"type" : "string", "store" : true }
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}
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}
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}
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'
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--------------------------------------------------
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Here is how we can change the default
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<<mapping-date-format,date_formats>> used in the
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root and inner object types:
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[source,js]
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--------------------------------------------------
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{
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"_default_" : {
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"dynamic_date_formats" : ["yyyy-MM-dd", "dd-MM-yyyy", "date_optional_time"]
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}
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}
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--------------------------------------------------
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[float]
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=== Unmapped fields in queries
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Queries and filters can refer to fields that don't exist in a mapping. Whether this
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is allowed is controlled by the `index.query.parse.allow_unmapped_fields` setting.
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This setting defaults to `true`. Setting it to `false` will disallow the usage of
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unmapped fields in queries.
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When registering a new <<search-percolate,percolator query>> or creating
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a <<filtered,filtered alias>> then the `index.query.parse.allow_unmapped_fields` setting
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is forcefully overwritten to disallowed unmapped fields. |