Posting index settings returns error

After a GET from http://localhost:8091/settings/indexes > moi.json

cat moi.json:

{"storageMode":"memory_optimized","indexerThreads":0,"memorySnapshotInterval":200,"stableSnapshotInterval":5000,"maxRollbackPoints":5,"logLevel":"info"}

curl http://localhost:8091/settings/indexes -u Administrator:password -XPOST -d @./moi.json
{"errors":{"

{\"storageMode\":\"memory_optimized\",\"indexerThreads\":0,\"memorySnapshotInterval\":200,\"stableSnapshotInterval\":5000,\"maxRollbackPoints\":5,\"logLevel\":\"info\"}

":"Found unsupported key

{\"storageMode\":\"memory_optimized\",\"indexerThreads\":0,\"memorySnapshotInterval\":200,\"stableSnapshotInterval\":5000,\"maxRollbackPoints\":5,\"logLevel\":\"info\"}

"}}