title: Why server-less CosmosDB is too much slow when we update the indices?
body: <p>I have migrated all my databases to CosmosDB with Mongo API by removing indices. After the migration, I started creating indices manually on CosmosDB. I have a collection called to order. It has 7 Million documents each document is nearly 1 KB in size. But as I update the index it is taking a lot of time. I am checking the index update status. It is been 30 minutes still the update is only 40 % complete. is this index update is a lot of RU consuming operation.? I know we have a limitation of 5000 RU/s per container. So is this slowness is because of that. If someone knows the answer to this please help me. And also, will the Azure cost me for the RU's that I consume during an index update. I have read somewhere that it won't.</p>