request = (mQueryOptions) => {
			const sResourcePath = this.sResourcePath
				+ this.oRequestor.buildQueryString(this.sMetaPath, mQueryOptions, false, true);
			aOutOfPlacePromises.push(this.oRequestor.request("GET", sResourcePath,
				oGroupLock.getUnlockedCopy()));
		}
Creates and returns the request promises for out-of-place nodes, so that they can later be
moved to their out-of-place position in the cache.

@param {sap.ui.model.odata.v4.lib._GroupLock} oGroupLock
  An original lock for the group ID to be used for the GET request, to be cloned via
  {@link sap.ui.model.odata.v4.lib._GroupLock#getUnlockedCopy}
@returns {Promise[]}
  The request promises

@private
@see #handleOutOfPlaceNodes