Cannot write 2MB data into cosmos with bulkImport

[yuzhangyi]

Hi, @FabianMeiswinkel,

   In cosmos-spark-connector, it seems like we cannot write 2MB data as single document into cosmos with bulkimport. After reading the source code https://github.com/Azure/azure-cosmosdb-spark/blob/1247559cae6b843a1ddc9fae9827222578abd42d/src/main/scala/com/microsoft/azure/cosmosdb/spark/CosmosDBSpark.scala#L153,  we must use option "MaxMiniBatchImportSizeKB" to let customer set the value, otherwise the max size is 100KB. 

  val maxMiniBatchImportSizeKB: Int = writeConfig.get[String](CosmosDBConfig.MaxMiniBatchImportSizeKB)
  .getOrElse(CosmosDBConfig.DefaultMaxMiniBatchImportSizeKB.toString)
  .toInt

As I know, the max size of per document in cosmos DB is 2MB, if the customer set big value on "MaxMiniBatchImportSizeKB", what will happen? At the same time, could we make the default value of "DefaultMaxMiniBatchImportSizeKB" as 2048?

Thanks!