private ChangeFeedCacheEntry getNextChangeFeed(String partitionId, String startRequestContinuationToken)
      throws CosmosException {
    return getNextChangeFeed(partitionId, startRequestContinuationToken, UUID.randomUUID().toString());
  }
Populate change feed cache by querying Cosmos for the next set of change feed entries after the specified request
continuation token. Also generate a new session id for the cache.
@param partitionId Partition for which the change feed cache needs to be populated.
@param startRequestContinuationToken request continuation token from which the change feed query needs to be made.
@return {@link ChangeFeedCacheEntry} object representing new cache entry.
ambry-cloud/src/main/java/com/github/ambry/cloud/azure/CosmosChangeFeedBasedReplicationFeed.java