Is it possible not all nodes in the cluster are sync on the same time?

Earlier I have posted a question describing a behavior which I couldn'nt understand.
My entity was retrieved in the response by one filter, then not retrieve by a second filter.
After sleep() both filters worked.

It was not reproduced on a single node environment.
I now believe that on my clustered environment (ES Cluster) not all nodes are refreshed/sync on the same time.

Is it possible not all nodes in the cluster are sync on the same time?
Is it configurable?