[Feature/extensions] Provide Extension API to OpenSearch

[dbwiddis]

Signed-off-by: Daniel Widdis widdis@gmail.com

Description

Companion PR: opensearch-project/opensearch-sdk-java#74

Extensions will report their APIs to the ExtensionsOrchestrator upon initial registration and potentially later in the Extension's lifecycle. These APIs will be registered and mapped so that when Users submit API requests they can be forwarded to the appropriate extensions.

This PR handles the communication of the REST API from the Extension to OpenSearch. Future PRs will complete the process of registering the REST Handlers and redirecting inbound requests.

Issues Resolved

Fixes opensearch-project/opensearch-sdk-java#68

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1315/
• CommitID: 6aeb8feffe994525154a8e47c82d8cc4ae0f7c30

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1328/
• CommitID: c756aa1628f27c31e3bf9e6190b6f3d5f7617990

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1329/
• CommitID: 956178fd1dcc85c916826eba2cc6fc145533385e

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1333/
• CommitID: f369987e5bfbd02a75288229c4b0c67db2073bcd

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1336/
• CommitID: a31ab795f89fe8e24df9b988f6bd15144f46deec

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1337/
• CommitID: 728e376eb75bad57bfa6a1e1eff759da81220019

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1423/
• CommitID: 7cd912676dd420376904bfad0aa48900a2c3a948

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1448/
• CommitID: 534f97641b91da456d9242597cdb1d0a77b5e8d7

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1450/
• CommitID: 3a7f564c2b0474fbc9dafd6a8c85e68fb76c8d68

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1909/
• CommitID: 4cbd4b27d7e15f5bf2828add10ede0382f8cbbbc

[owaiskazi19]

Precommit failing

> Task :server:compileJava
/home/runner/work/OpenSearch/OpenSearch/server/src/main/java/org/opensearch/extensions/ExtensionsOrchestrator.java:232: error: cannot find symbol
                    extensionsList.add(de);
                                       ^
  symbol:   variable de
  location: class ExtensionsOrchestrator
/home/runner/work/OpenSearch/OpenSearch/server/src/main/java/org/opensearch/extensions/ExtensionsOrchestrator.java:233: error: cannot find symbol
                    extensionIdMap.put(extension.getUniqueId(), de);
                                                                ^
  symbol:   variable de

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1910/
• CommitID: d3a2560

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1911/
• CommitID: 3794d6a

[owaiskazi19]

Comments will be addressed in the follow up PR.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1912/
• CommitID: 3794d6a

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1913/
• CommitID: 3794d6a

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: ❌
• URL:
• CommitID: 3794d6a

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1919/
• CommitID: 3794d6a

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1939/
• CommitID: 156dc9d

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1940/
• CommitID: 156dc9d

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/1941/
• CommitID: 156dc9d

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/1952/
• CommitID: 4e75c43