public EntryEventImpl setCreate(boolean isCreate) {
    setEventFlag(EventFlags.FLAG_ISCREATE, isCreate);
    return this;
  }
this is used to distinguish an event that merely has Operation.CREATE from one that originated
from Region.create() for delta processing purposes.
geode-core/src/main/java/org/apache/geode/internal/cache/EntryEventImpl.java