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The uppermost level of a mapping is known as the root object. It may contain the following:
A properties section, which lists the mapping for each field that a document may contain
Various metadata fields, all of which start with an underscore, such
as _type, _id, and _source
Settings, which control how the dynamic detection of new fields
is handled, such as analyzer, dynamic_date_formats, and
dynamic_templates
Other settings, which can be applied both to the root object and to fields
of type object, such as enabled, dynamic, and include_in_all
We have already discussed the three most important settings for document fields or properties in [core-fields] and [complex-core-fields]:
typeThe datatype that the field contains, such as string or date
indexWhether a field should be searchable as full text (analyzed), searchable as an exact value (not_analyzed), or not searchable at all (no)
analyzerWhich analyzer to use for a full-text field, both at index time and at search time
We will discuss other field types such as ip, geo_point, and geo_shape in
the appropriate sections later in the book.
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