Peer logs showing many spurious Warnings for CouchDB batch document delete.

While running performance test FAB-10134, (marbles02_private chaincode invokes) the peer logs showing many WARN messages.

These WARN messages are many in numbers and also there is no followup message if it ever succeeded or failed.

2018-06-14 08:48:07.820 UTC [statecouchdb] commitUpdates -> WARN ac6 CouchDB batch document delete encountered an problem. Retrying delete for document ID:marble_testorgschannel1_org1_0_0_215
2018-06-14 08:48:07.856 UTC [statecouchdb] commitUpdates -> WARN ac7 CouchDB batch document delete encountered an problem. Retrying delete for document ID:+PNgBRLenRHM/r9ijK4lHA+x4y0CimDIsMbvaQ2OJ2E=
2018-06-14 08:48:07.864 UTC [statecouchdb] commitUpdates -> WARN ac8 CouchDB batch document delete encountered an problem. Retrying delete for document ID:marble_testorgschannel1_org1_0_2_214
2018-06-14 08:48:07.880 UTC [statecouchdb] commitUpdates -> WARN ac9 CouchDB batch document delete encountered an problem. Retrying delete for document ID:a7ClArdd8EWpJIWVHgX+7JxpGL3Mjg3M4GZPhZ33wWo=
2018-06-14 08:48:07.891 UTC [statecouchdb] commitUpdates -> WARN aca CouchDB batch document delete encountered an problem. Retrying delete for document ID:fPPVbZ/b0lUarJjE4kzw9F2/MopPULZpm0F8i5hWc2A=
2018-06-14 08:48:07.898 UTC [statecouchdb] commitUpdates -> WARN acb CouchDB batch document delete encountered an problem. Retrying delete for document ID:marble_testorgschannel1_org1_0_3_214
2018-06-14 08:48:07.920 UTC [statecouchdb] commitUpdates -> WARN acc CouchDB batch document delete encountered an problem. Retrying delete for document ID:vTJO+YXxASI4nxtziIj2FrfcTrOTX6JU+Rbdeeh39Bk=
2018-06-14 08:48:07.923 UTC [statecouchdb] commitUpdates -> WARN acd CouchDB batch document delete encountered an problem. Retrying delete for document ID:marble_testorgschannel1_org1_0_3_213
2018-06-14 08:48:07.934 UTC [statecouchdb] commitUpdates -> WARN ace CouchDB batch document delete encountered an problem. Retrying delete for document ID:K0nSMriXl5/SuRwAyqvI7yKd0WJQvTNcJa3n1A+oESo=
2018-06-14 08:48:07.939 UTC [statecouchdb] commitUpdates -> WARN acf CouchDB batch document delete encountered an problem. Retrying delete for document ID:marble_testorgschannel1_org1_0_2_210
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