The desired instance type and desired number of replicas of each index partition.
The instance type that you want to preconfigure for your domain. For example,
search.m1.small | search.m3.medium | search.m3.large | search.m3.xlarge | search.m3.2xlarge
For domains created prior to February, 2015, valid values may also include
The number of partitions you want to preconfigure for your domain. Only valid when you select
m3.2xlargeas the instance type.
The number of replicas you want to preconfigure for each index partition.