[ Exception type: database ] [ Driver: MONGO ] [ Operation aggregate ] [ Type collection ] MongoDB::SelectionError: No readable server available for matching read preference primary. MongoDB server status: Topology type: Sharded; Member status: pca092-ps-prod-lb-mongo-03-ip18.psrkpc.ysicloud.com:27017 (type: Unknown, error: MongoDB::NetworkError: Could not connect to 'pca092-ps-prod-lb-mongo-03-ip18.psrkpc.ysicloud.com:27017': Name or service not known ) pca092-ps-prod-lb-mongo-01-ip16.psrkpc.ysicloud.com:27017 (type: Unknown, error: MongoDB::NetworkError: Could not connect to 'pca092-ps-prod-lb-mongo-01-ip16.psrkpc.ysicloud.com:27017': Name or service not known ) pca092-ps-prod-lb-mongo-02-ip17.psrkpc.ysicloud.com:27017 (type: Unknown, error: MongoDB::NetworkError: Could not connect to 'pca092-ps-prod-lb-mongo-02-ip17.psrkpc.ysicloud.com:27017': Name or service not known )