OpenSearch (parlel emulator)
A zero-dependency, in-process fake of the Amazon OpenSearch Service control
plane. The data plane reuses the parlel elasticsearch emulator.
| Property | Value |
|---|---|
| Port | 4726 |
| Protocol | REST/JSON (paths under /2021-01-01/opensearch) |
| Healthcheck | GET /_parlel/health |
| Reset | POST /_parlel/reset |
Default connection
AWS_REGION=us-east-1
AWS_ENDPOINT_URL=http://127.0.0.1:4726
AWS_ACCESS_KEY_ID=parlel
AWS_SECRET_ACCESS_KEY=parlel
Supported operations / paths
| Operation | Path |
|---|---|
| CreateDomain | POST /2021-01-01/opensearch/domain |
| DescribeDomain | GET /2021-01-01/opensearch/domain/{name} |
| ListDomainNames | GET /2021-01-01/opensearch/domain |
| DescribeDomains | POST /2021-01-01/opensearch/domain-info |
| DeleteDomain | DELETE /2021-01-01/opensearch/domain/{name} |
SDK example
import { OpenSearchClient, CreateDomainCommand } from "@aws-sdk/client-opensearch";
const os = new OpenSearchClient({
region: "us-east-1",
endpoint: "http://127.0.0.1:4726",
credentials: { accessKeyId: "parlel", secretAccessKey: "parlel" },
});
const { DomainStatus } = await os.send(new CreateDomainCommand({ DomainName: "logs" }));
console.log(DomainStatus?.Endpoint); // search-logs-parlel.us-east-1.es.amazonaws.com
For indexing/searching documents, point an OpenSearch/Elasticsearch client at
the parlel elasticsearch emulator.
Access via MCP / preview URL
Reachable through the parlel pool MCP bridge and preview URL. No auth setup required.
Surface coverage
This emulator faithfully replicates the API surface most application code and agents exercise. Anything below the supported lines is either an intentional design choice for a fast, zero-cost local emulator (✓ By design) or a candidate for a future release (⟳ Roadmap) — never a silent inaccuracy.
Legend: ✅ fully supported · ◐ accepted (stored, not strictly enforced) · ✓ by design · ⟳ on the roadmap.
| Area | Limitation |
|---|---|
| Data plane | This is control-plane only — use the elasticsearch emulator. |
| Provisioning | Domains are usable immediately; cluster config is cosmetic. |
| VPC / IAM | Network and access policies are stored but not enforced. |
| Upgrades | UpgradeDomain is not implemented. |
Configuration — test.env
Copy these into your test.env (used by the bridge sidecar flow). Tokens are Parlel's seeded test credentials — any non-empty value is accepted by the emulator, so you rarely need to change them. Swap in real credentials only when pointing at the live service in prod.env.
AWS_ACCESS_KEY_ID=parlel
AWS_SECRET_ACCESS_KEY=parlel
AWS_REGION=us-east-1
AWS_ENDPOINT_URL=http://parlel-bridge:4726