# Migration Assessment — Executive Summary

**Date**: {{ date }}  
**Skill**: amazon-opensearch-service v{{ skill_version }}  
**Source**: {{ fingerprint.source_engine | default:'unknown' }} {{ fingerprint.version | default:'(version not provided)' }} ({{ fingerprint.summary.total_gb | default:'?' }} GB / {{ fingerprint.summary.index_count | default:'?' }} indexes)  
**Target**: Amazon OpenSearch {{ migration_path.decision_inputs.target | default:'Service' }} ({{ sizing.region | default:'us-east-1' }})

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## TL;DR

- **Recommendation**: Proceed with **{{ migration_path.recommended }}** for the data movement.
- **Readiness Score**: **{{ readiness.overall_score }}/100** ({{ readiness.tier }})
- **Sizing inputs for Pricing Calculator**: see Sizing section in the full report; plug values into <https://calculator.aws> for monthly cost.
- This skill MUST NOT estimate dollar costs because pricing changes monthly and account-specific RI / Savings Plan / EDP discounts are out of scope — those route to <https://calculator.aws>.

## Why migrate

The current {{ fingerprint.source_engine }} stack has known migration specifics and risk-blockers that the assessment surfaces. Amazon OpenSearch Service / Serverless NextGen eliminates self-managed infrastructure, provides managed snapshots, multi-AZ HA, and access to the OpenSearch ecosystem (Anomaly Detection, Alerting, ISM, Security Analytics). Specifically for {{ fingerprint.source_engine }} sources, AWS publishes a prescriptive guide that informs every step of this assessment.

## Three items to flag

Frame items with a known remediation as **migration specifics** (the path already handles them); reserve **risk** framing for items with no clean fix, capacity-plan implications, or target-choice constraints.

1. _Add the top risk-blocker (BLOCKING with no clean remediation) here_
2. _Add the top migration specific (HIGH item the path already handles) OR the second risk-blocker, whichever has higher impact_
3. _Add the top operational/cost item here — frame per its lane_

## Decision

| Tier | Action |
|---|---|
| GREEN (≥80) | You MUST proceed; assign owner, target date |
| YELLOW (60–79) | You MUST PoC + spike on the lowest-scoring dimension before committing |
| RED (<60) | You MUST NOT commit because the readiness score is below the safe-migration threshold; revisit the weakest dimension first |

**Current tier**: **{{ readiness.tier }}**

## Citations

For the canonical retrieval recipe (every URL the skill ever cites — AWS Prescriptive Guidance for Solr → OpenSearch, OpenSearch Service pricing, Migration Assistant for Amazon OpenSearch Service, sizing-domains, serverless-overview, …) see [`knowledge-retrieval.md`](../references/assessment-knowledge-retrieval.md). You MUST cite the live URLs you actually retrieved here, with retrieval timestamps; <https://calculator.aws> is the cost handoff.

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_Full assessment in `MIGRATION_ASSESSMENT.md`. Technical deep-dive in `TECHNICAL_DEEP_DIVE.md`._  
_Generated by amazon-opensearch-service v{{ skill_version }} on {{ date }}._