Add Location header and improve REST testing

This adds a header that looks like `Location: /test/test/1` to the
response for the index/create/update API. The requirement for the header
comes from https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html

https://tools.ietf.org/html/rfc7231#section-7.1.2 claims that relative
URIs are OK. So we use an absolute path which should resolve to the
appropriate location.

Closes #19079

This makes large changes to our rest test infrastructure, allowing us
to write junit tests that test a running cluster via the rest client.
It does this by splitting ESRestTestCase into two classes:
* ESRestTestCase is the superclass of all tests that use the rest client
to interact with a running cluster.
* ESClientYamlSuiteTestCase is the superclass of all tests that use the
rest client to run the yaml tests. These tests are shared across all
official clients, thus the `ClientYamlSuite` part of the name.

1 files changed, 3 insertions, 3 deletions

diff --git a/plugins/repository-azure/src/test/java/org/elasticsearch/repositories/azure/AzureRepositoryRestIT.java b/plugins/repository-azure/src/test/java/org/elasticsearch/repositories/azure/AzureRepositoryRestIT.java
index ad58838bf5..3c565d407c 100644
--- a/plugins/repository-azure/src/test/java/org/elasticsearch/repositories/azure/AzureRepositoryRestIT.java
+++ b/plugins/repository-azure/src/test/java/org/elasticsearch/repositories/azure/AzureRepositoryRestIT.java
@@ -21,13 +21,13 @@ package org.elasticsearch.repositories.azure;
 
 import com.carrotsearch.randomizedtesting.annotations.Name;
 import com.carrotsearch.randomizedtesting.annotations.ParametersFactory;
-import org.elasticsearch.test.rest.ESRestTestCase;
+import org.elasticsearch.test.rest.ESClientYamlSuiteTestCase;
 import org.elasticsearch.test.rest.RestTestCandidate;
 import org.elasticsearch.test.rest.parser.RestTestParseException;
 
 import java.io.IOException;
 
-public class AzureRepositoryRestIT extends ESRestTestCase {
+public class AzureRepositoryRestIT extends ESClientYamlSuiteTestCase {
 
     public AzureRepositoryRestIT(@Name("yaml") RestTestCandidate testCandidate) {
         super(testCandidate);
@@ -35,7 +35,7 @@ public class AzureRepositoryRestIT extends ESRestTestCase {
 
     @ParametersFactory
     public static Iterable<Object[]> parameters() throws IOException, RestTestParseException {
-        return ESRestTestCase.createParameters(0, 1);
+        return ESClientYamlSuiteTestCase.createParameters(0, 1);
     }
 }