If the Instance Type doesn't appear under this section AWS Commitment Discounts won't recommend for that Instance Type e.g. - t2.medium.search doesn't appear in the above list.
Elasticache - A number of Node Types are now considered Previous Generation Node Types and will be listed under - https://aws.amazon.com/elasticache/previous-generation/ -> "Previous Generation Reserved Nodes for Amazon ElastiCache"
Previous Generation Reserved Nodes aren't possible to be purchased from AWS as of June 1, 2023 as mentioned under - https://aws.amazon.com/elasticache/previous-generation/ these Nodes won't have Recommendations made under AWS Commitment Discounts.