Amazon OpenSearch – Consider Latest Generation Instances for m-Family

Migrate Amazon OpenSearch M3 instances to M5 to achieve better performance, enhanced features, and significant cost savings.

Why Upgrading Matters

Performance and Cost Advantages

• Higher CPU Performance: M5 instances offer more advanced processors

• Storage Flexibility: Support for gp3 storage

• Substantial Cost Reduction: Up to 25% lower monthly expenses

Enhanced Security Features:

Encryption at rest

Fine-grained access control

Cross-cluster search capabilities

Comparative Instance Analysis

Instance TypeMemoryvCPUsMonthly CostSavings m3.2xlarge30 GiB8$549–m5.2xlarge32 GiB8$41325%

Implementation Guide

Infrastructure-as-Code Upgrade Example (Terraform)

Before (Legacy M3 Instance)

resource "aws_elasticsearch_domain" "example" {
  domain_name           = "old-search-domain"
  elasticsearch_version = "7.10"
cluster_config {
    instance_type = "m3.2xlarge.search"
  }
}

resource "aws_elasticsearch_domain" "example" {
  domain_name           = "old-search-domain"
  elasticsearch_version = "7.10"
cluster_config {
    instance_type = "m3.2xlarge.search"
  }
}

resource "aws_elasticsearch_domain" "example" {
  domain_name           = "old-search-domain"
  elasticsearch_version = "7.10"
cluster_config {
    instance_type = "m3.2xlarge.search"
  }
}

After (Optimized M5 Instance)

resource "aws_elasticsearch_domain" "example" {
  domain_name           = "optimized-search-domain"
  elasticsearch_version = "7.10"
cluster_config {
    instance_type = "m5.2xlarge.search"
  }
}

resource "aws_elasticsearch_domain" "example" {
  domain_name           = "optimized-search-domain"
  elasticsearch_version = "7.10"
cluster_config {
    instance_type = "m5.2xlarge.search"
  }
}

resource "aws_elasticsearch_domain" "example" {
  domain_name           = "optimized-search-domain"
  elasticsearch_version = "7.10"
cluster_config {
    instance_type = "m5.2xlarge.search"
  }
}

Manual Migration Steps

• Backup your existing OpenSearch domain

• Create a new M5 domain with identical configuration

• Migrate data using snapshot and restore

• Update DNS and routing configurations

Decommission old M3 domain

Best Practices

• Gradual Migration: Implement phased rollout

• Performance Testing: Validate performance post-migration

• Cost Monitoring: Track actual savings

Recommended Tools

Infracost: Automatically detect and estimate savings from instance upgrades

AWS Cost Explorer

CloudWatch metrics for performance comparison

Real-World Examples

Scenario 1: Enterprise Search Platform

A media company running multiple M3 instances for content indexing:

• Before: 5x m3.2xlarge instances at $549 each = $2,745/month

• After: 5x m5.2xlarge instances at $413 each = $2,065/month

Annual Savings: $8,280

Scenario 2: E-commerce Product Search

An online retailer with high-traffic product search:

Reduced latency by 15%

Decreased operational costs

Improved search result relevance

Considerations and Caveats

Potential Limitations

Temporary performance impact during migration

Compatibility with existing plugins

• Potential minimal downtime during transition

• When to Avoid Immediate Upgrade

Highly customized legacy configurations

Strict compliance requirements

Immediate budget constraints

Frequently Asked Questions (FAQs)

How long does an OpenSearch instance migration typically take?
Most migrations can be completed within 2-4 hours, depending on data volume and complexity.

Most migrations can be completed within 2-4 hours, depending on data volume and complexity.
Primary costs include data transfer and potential temporary duplicate infrastructure during transition.

Can I automate this migration process?
Yes, tools like Infracost can help identify and estimate migration savings automatically.

What version compatibility should I consider?
Ensure your OpenSearch version is compatible across both source and target instances.

How often should I review instance generations?
Recommend quarterly reviews of instance types and generations for ongoing optimization.