pods are in pending state for so long

[pravink]

kubectl get pods
NAME READY STATUS RESTARTS AGE
elasticsearch-operator-sysctl-hhdqs 0/1 Pending 0 83m

I am trying to create the es cluster using below commands
kubectl create ns operator
kubectl create -f example/controller.yaml -n operator
kubectl create -n operator -f example/example-es-cluster.yaml
kubectl get pods

but i get the status pending and nothing in the logs
kubectl logs elasticsearch-operator-sysctl-gpr6n

does anyone has any idea why about this issue?