Wait for cluster health instead of log message in ElasticsearchContainer - #12069
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Elasticsearch may open port 9200 and emit the "started" log message before completing security initialization (e.g. generating keys, creating internal indices). Replace the log-message wait strategy with an HTTP health check on /_cluster/health that only passes when the cluster status is yellow or green. The wait strategy is configured in configure() so it can read the final env map, including any password or SSL settings the user applies after construction. When the image tag is non-numeric (e.g. "latest"), isAtLeastMajorVersion8 may be true even though the actual image is older and uses HTTP. Use the version-based HTTPS default only when the tag is a concrete numeric version.
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughElasticsearch startup now waits for port 9200, detects the live HTTP scheme, and checks ChangesElasticsearch startup health checks
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The new readiness check may send Elasticsearch credentials over HTTP, which can expose configured secrets when TLS is not enabled. This should be resolved or explicitly accepted before merge. Sequence Diagram(s)sequenceDiagram
participant ElasticsearchContainer
participant HttpWaitStrategy
participant Elasticsearch
ElasticsearchContainer->>ElasticsearchContainer: configure()
ElasticsearchContainer->>Elasticsearch: wait for port 9200
ElasticsearchContainer->>Elasticsearch: detect HTTP scheme with curl
ElasticsearchContainer->>HttpWaitStrategy: configure /_cluster/health with remaining timeout
HttpWaitStrategy->>Elasticsearch: request cluster health with basic auth
Elasticsearch-->>HttpWaitStrategy: HTTP 200 with yellow or green status
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In
`@modules/elasticsearch/src/main/java/org/testcontainers/elasticsearch/ElasticsearchContainer.java`:
- Around line 238-240: Update configureWaitStrategy around getHttpScheme() so
7.x custom HTTPS configurations are not permanently assigned an HTTP strategy
before startup. Use a wait strategy that probes both HTTP and HTTPS during
startup, or require an explicit protocol setting for configurations supplied
through mounted files or commands, while preserving the existing behavior for
explicit protocol settings.
- Line 124: Update the isVersionNumeric assignment to recognize only fully
numeric version tags, requiring numeric components after the dot rather than
accepting arbitrary suffixes such as “8.custom” or “8.”. Preserve the existing
version-selection behavior for valid numeric tags and ensure custom or
incomplete tags do not select HTTPS.
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Tags like "8.custom" start with a digit and a dot but are not a real version. Require at least major.minor (both numeric) so that valid variant tags such as "9.5.2-arm64" are still accepted while ambiguous custom tags are not.
dadoonet
reviewed
Sep 9, 2026
| // Version-based default: 8.x uses HTTPS by default. | ||
| // Only apply when the version tag is a concrete numeric version; ambiguous tags | ||
| // like "latest" may point to an older image that uses HTTP. | ||
| if (isAtLeastMajorVersion8 && isVersionNumeric) { |
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I'm unsure about the need here for isVersionNumeric. If we do that here we should then do this check everywhere? Like: https://github.com/testcontainers/testcontainers-java/pull/12069/changes#diff-8af1f477d2bcf3c11f31ecc8b703ce0873f869dbefd5714fa3c78810f02a7cc7L125
I'm unsure it's worth it.
I'd prefer a method like void forceHttpScheme(String) in case someone needs it but I don't think it's worth it.
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Yeah, this is legit, that's why this block is gone ^^
Previously getHttpScheme() was called from configure(), before the container starts. For 7.x with SSL configured via a mounted config file rather than env vars, this would always resolve to HTTP because the curl probe requires a running container. Wrapping the health check in an AbstractWaitStrategy defers the getHttpScheme() call to the moment the container is already up, so the curl probe is available for all configurations.
…HttpScheme Before calling getHttpScheme() in the wait strategy, wait for port 9200 to accept TCP connections. This guarantees the curl probe always finds a live socket, so the version-based isAtLeastMajorVersion8/isVersionNumeric shortcut is no longer needed and is removed. getHttpScheme() now relies solely on explicit env-var config and the curl probe, matching its original behaviour.
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Actionable comments posted: 2
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Inline comments:
In
`@modules/elasticsearch/src/main/java/org/testcontainers/elasticsearch/ElasticsearchContainer.java`:
- Line 244: Update the readiness flow around HostPortWaitStrategy and
HttpWaitStrategy to share a single startupTimeout budget: establish a deadline
before the port wait, then calculate and pass only the remaining duration to the
HttpWaitStrategy health wait, while preserving the existing wait behavior when
time remains.
- Line 249: Update the HTTP wait-strategy setup around ElasticsearchContainer’s
withBasicCredentials call so ELASTIC_PASSWORD is never sent over cleartext. When
authentication is required, use certificate-validating HTTPS or execute the
authenticated probe inside the container, and remove the allowInsecure() path
for credentialed HTTPS; preserve unauthenticated HTTP behavior.
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Member
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Found a regression in the current implementation: @Test
void changedPasswordAfterStopStartsAgain() {
try (
ElasticsearchContainer container = new ElasticsearchContainer(
"docker.elastic.co/elasticsearch/elasticsearch:9.2.4"
).withStartupTimeout(Duration.ofSeconds(30))
) {
container.start();
container.stop();
container.withPassword("changed-password");
container.start(); // Times out: health check still uses the old password.
}
} |
Both steps now draw from one deadline computed at the start of waitUntilReady(), so the total wait is bounded by startupTimeout instead of potentially 2x that.
…tials Password was previously captured at configure() time and baked into the wait-strategy closure. On a stop/withPassword/start cycle the guard `if (getWaitStrategy() != null) return` prevented reconfiguration, so the health check kept using the original password and timed out. Moving the env-map lookup inside waitUntilReady() ensures the current password is always used, regardless of how many times the container is restarted.
kiview
approved these changes
Sep 9, 2026
kiview
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There is one nit finding, that timeout excludes execution of getHttpScheme(), but I think it's fine as is, that shouldn't contribute majorly in practice.
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Elasticsearch may open port 9200 and emit the
startedlog message beforecompleting security initialization (e.g. generating keys, creating internal
indices). Replace the log-message wait strategy with an HTTP health check on
/_cluster/healththat only passes when the cluster status is yellow or green.The wait strategy is configured in
configure()so it can read the final envmap, including any password or SSL settings the user applies after construction.
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