Publish the ppl-rest-spi snapshot artifact

[ahkcs]

Description

#5656 added the ppl-rest-spi module and made opensearch depend on it (opensearch/build.gradle: api project(':ppl-rest-spi')). The published unified-query-opensearch POM therefore carries a compile-scope dependency on org.opensearch.query:ppl-rest-spi — but that artifact was never published.

The publish workflow runs only:

./gradlew publishUnifiedQueryPublicationToSnapshotsRepository

which matches publications named unifiedQuery. ppl-rest-spi deliberately names its publication restSpi so it keeps the plain ppl-rest-spi artifactId rather than the unified-query- prefix (see the comment in ppl-rest-spi/build.gradle), so its publish task never runs.

Result: every external consumer of unified-query-opensearch — opensearch-spark, opensearch-cli, and the OpenSearch sandbox — fails to resolve dependencies.

ppl-rest-spi/build.gradle already configures the publication and the Snapshots repository correctly, so this just runs its publish task alongside the existing one. No build-logic change.

Verification

The dangling reference, in the currently published POM (unified-query-opensearch-3.8.0.0-20260804.211640-79.pom):

<dependency>
  <groupId>org.opensearch.query</groupId>
  <artifactId>ppl-rest-spi</artifactId>
  <version>3.8.0.0-SNAPSHOT</version>
  <scope>compile</scope>
</dependency>

And the artifact is absent from every configured repository:

Repository	ppl-rest-spi metadata
ci.opensearch.org/ci/dbc/snapshots/maven	404
ci.opensearch.org/maven2	404
repo.maven.apache.org/maven2	404

Confirmed the task produces exactly the coordinates the resolver searches for, via :ppl-rest-spi:publishRestSpiPublicationToMavenLocal:

org/opensearch/query/ppl-rest-spi/3.8.0.0-SNAPSHOT/ppl-rest-spi-3.8.0.0-SNAPSHOT.pom
org/opensearch/query/ppl-rest-spi/3.8.0.0-SNAPSHOT/ppl-rest-spi-3.8.0.0-SNAPSHOT.jar
org/opensearch/query/ppl-rest-spi/3.8.0.0-SNAPSHOT/ppl-rest-spi-3.8.0.0-SNAPSHOT.module

Downstream failure this fixes

sandbox-check in opensearch-project/OpenSearch (e.g. run 30951657273, failing in under 2 minutes at dependency resolution):

Could not determine the dependencies of task
':sandbox:plugins:test-ppl-frontend:forbiddenApisMain'.
> Could not resolve all dependencies for configuration
  ':sandbox:plugins:test-ppl-frontend:runtimeClasspath'
   > Could not find org.opensearch.query:ppl-rest-spi:3.8.0.0-SNAPSHOT
     Required by:
       test-ppl-frontend > unified-query-ppl > unified-query-protocol
                         > unified-query-opensearch

Note this needs a merge to main to take effect, since the publish workflow only triggers on push to a release branch.

Check List

• Commits are signed per the DCO using --signoff.
• New functionality includes testing — not applicable; CI workflow change, verified via publishRestSpiPublicationToMavenLocal.
• Public documentation issue/PR created — not applicable; no user-facing change.

[github-actions]

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