elasticsearch-js/docs/reference/api/IndicesStorage.md

Interface IndicesStorage

Name	Type	Description
allow_mmap	boolean	You can restrict the use of the mmapfs and the related hybridfs store type via the setting node.store.allow_mmap. This is a boolean setting indicating whether or not memory-mapping is allowed. The default is to allow it. This setting is useful, for example, if you are in an environment where you can not control the ability to create a lot of memory maps so you need disable the ability to use memory-mapping.
type	IndicesStorageType