r6gd.large.search is an AWS OpenSearch size with 2 vCPUs, 16 GiB memory. In US East (N. Virginia) it costs $0.191 per hour on demand ($139.43 per month); a 1-year reserved instance with no upfront costs $0.132 per hour, 31% less. It is sold in 15 regions; the cheapest is Asia Pacific (Mumbai) at $0.124 per hour.
Prices by region
USD per hour. Reserved prices are no upfront, standard. Cheapest on-demand first.