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Index
@GE{Index}: Indexes are used to allow fast access to documents. For
each collection there is always the primary index which is a hash
index for the document key (_key attribute). This index cannot be
dropped or changed.
Edge collections will also have an automatically created edges index,
which cannot be modified. This index provides quick access to documents
via the _from and _to attributes.
Most user-land indexes can be created by defining the names of the attributes which should be indexed. Some index types allow indexing just one attribute (e.g. fulltext index) whereas other index types allow indexing multiple attributes.
Indexing system attributes such as _id, _key, _from, and _to
in user-defined indexes is not supported by any index type. Manually
creating an index that relies on any of these attributes is unsupported.