Density

The density configuration for the index.

Enums
`DENSITY_UNSPECIFIED`	Unspecified. It will use database default setting. This value is input only.
`SPARSE_ALL`	An index entry will only exist if ALL fields are present in the document. This is both the default and only allowed value for Standard Edition databases (for both Cloud Firestore `ANY_API` and Cloud Datastore `DATASTORE_MODE_API` ). Take for example the following document: `{ "__name__": "...", "a": 1, "b": 2, "c": 3 }` an index on `(a ASC, b ASC, c ASC, __name__ ASC)` will generate an index entry for this document since `a` , 'b', `c` , and `__name__` are all present but an index of `(a ASC, d ASC, __name__ ASC)` will not generate an index entry for this document since `d` is missing. This means that such indexes can only be used to serve a query when the query has either implicit or explicit requirements that all fields from the index are present.
`SPARSE_ANY`	An index entry will exist if ANY field are present in the document. This is used as the definition of a sparse index for Enterprise Edition databases. Take for example the following document: `{ "__name__": "...", "a": 1, "b": 2, "c": 3 }` an index on `(a ASC, d ASC)` will generate an index entry for this document since `a` is present, and will fill in an `unset` value for `d` . An index on `(d ASC, e ASC)` will not generate any index entry as neither `d` nor `e` are present. An index that contains `__name__` will generate an index entry for all documents since Firestore guarantees that all documents have a `__name__` field.
`DENSE`	An index entry will exist regardless of if the fields are present or not. This is the default density for an Enterprise Edition database. The index will store `unset` values for fields that are not present in the document.

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Density