Connection Pool Cleared Exception

Connection pool for ServerId{clusterId=ClusterId{value=‘6294f04f10ec570412083368’, description=‘null’}, address=10.8.0.1:19018} is paused because another operation failed; nested exception is com.mongodb.MongoConnectionPoolClearedException: Connection pool for ServerId{clusterId=ClusterId{value=‘6294f04f10ec570412083368’, description=‘null’}, address=10.8.0.1:19018} is paused because another operation failed