Histograms:

type is used by only the /histogram endpoint and the options available to use on your query will depend on what you choose as your starting set It is a no-op in the /filter endpoint.

1. user - Usable by files and dirs. Groups the filtered INodes by their owner's username.
2. accessTime - Usable by files. Groups the filtered INodes in bucket ranges of their last accessed timestamp. Please note this only applies if your Hadoop cluster has accesstime enabled.
3. modTime - Usable by files and dirs. Groups the filtered INodes in bucket ranges of their last modified timestamp.
4. fileSize - Usable by files. Groups the filtered INodes in bucket ranges of file size bytes.
5. diskspaceConsumed - Usable by files. Groups the filtered INodes in bucket ranges of disk space bytes used.
6. memoryConsumed - Usable by files and dirs. Groups the filtered INodes in bucket ranges of NameNode memory bytes used.
7. fileReplica - Usable by files. Groups the filtered INodes by their replication factor.
8. parentDir - Usable by files and dirs. Groups the filtered INodes by their parent directory. You can use &parentDirDepth=<integer_depth> to define a strict depth you want to group by.
9. storageType - Usable by files and dirs. Groups the filtered INodes by their BlockStoragePolicy.
10. group - Usable by files and dirs. Groups the filtered INodes by their owner's group name.
11. fileType - Usable by files and dirs. Groups the filtered INodes by their file's extension.
12. dirQuota - Usable by dirs. Groups the filtered INodes by their quotas. You can decide by which quota via the sum.