[node.js] Running into 'unknown error with N1QL .. out-of-memory condition' error conditions when the underlying cause appears to be connection and not memory issues.

I am trying to connect to a Data+Query+Index Node using the sample node.js client library.

sample client script: https://github.com/couchbaselabs/devguide-examples/blob/master/nodejs/query-create-index.js

On running a simple create index script, I hit the below error, which seems to come from https://github.com/couchbase/couchnode/blob/c2eae98afca14c1a0298248c036b9c7e05db2d9c/lib/bucket.js#L681

/Users/ketaki/SA/client_sdk/devguide-examples/nodejs/query-create-index.js:18
    if (err) throw err;
             ^

Error: An unknown N1QL error occured. This is usually related to an out-of-memory condition.
    at /Users/ketaki/node_modules/couchbase/lib/bucket.js:680:15

I checked the query.log files, there are no errors on the query.log but this is at INFO level.

I checked the memory on the server , there is 11gb free space

[root@ip-10-0-49-186 logs]# free -g
              total        used        free      shared  buff/cache   available
Mem:             15           1          11           0           2          13
Swap:             0           0           0
[root@ip-10-0-49-186 logs]#

The server is fine with < 20% CPU and there is no other operation on this cluster.

Attached is the verbose client side logs, which shows the below error

 46 14879ms [I0] {22635/50f} [WARN] (lcbio - L:103) FIXME: Unknown iops/os error code 60. Using NETWORK_ERROR
 47 14879ms [I0] {22635/50f} [INFO] (lcbio - L:112) Translating errno=60, lcb=0x10 to NETWORK_ERROR
 48 14879ms [I0] {22635/50f} [ERROR] (connection - L:141) <ec2-34-209-199-75.us-west-2.compute.amazonaws.com:8093> (SOCK=0x10371c510) Failed to         establish connection: LCB_NETWORK_ERROR (0x10), os errno=60
 49 14879ms [I0] {22635/50f} [DEBUG] (lcbio_mgr - L:271) <ec2-34-209-199-75.us-west-2.compute.amazonaws.com:8093> (HE=0x103863a00) Received result      for I=0x10371c250,C=0x0; E=0x10
 50 14879ms [I0] {22635/50f} [ERROR] (http-io - L:227) Connection to failed with Err=0x10
 51 14879ms [I0] {22635/50f} [TRACE] (http-io - L:227) <ec2-34-209-199-75.us-west-2.compute.amazonaws.com:8093> POST  http://http://ec2-34-209-168-     150.us-west-2.compute.amazonaws.com:8093/query/service/query/service. Body=79 bytes