attempt to force multipart for testing

Author: bcully

modules/repository-s3/src/internalClusterTest/java/org/elasticsearch/repositories/s3/S3RepositoryThirdPartyTests.java

@@ -109,7 +109,8 @@ protected Settings nodeSettings() {
     protected void createRepository(String repoName) {
         Settings.Builder settings = Settings.builder()
             .put("bucket", System.getProperty("test.s3.bucket"))
-            .put("base_path", System.getProperty("test.s3.base", "testpath"));
+            .put("base_path", System.getProperty("test.s3.base", "testpath"))
+            .put("buffer_size", S3Repository.MIN_PART_SIZE_USING_MULTIPART);
         final String endpoint = USE_FIXTURE ? minio.getAddress() : System.getProperty("test.s3.endpoint");
         if (endpoint != null) {
             settings.put("endpoint", endpoint);

test/framework/src/main/java/org/elasticsearch/repositories/AbstractThirdPartyRepositoryTestCase.java

@@ -290,9 +290,12 @@ public void testIndexLatest() throws Exception {
 
     public void testReadFromPositionWithLength() {
         final var blobName = randomIdentifier();
-        final var blobBytes = randomBytesReference(randomIntBetween(100, 2_000));
+        // forcing multipart temporarily
+        final var blobBytes = randomBytesReference(randomIntBetween(25 * 1024 * 1024 + 100, 25 * 1024 * 1024 + 2_000));
 
         final var repository = getRepository();
+        logger.info("---> uploading blob of size {}", blobBytes.length());
+        logger.info("repository buffer size: {}", repository.getReadBufferSizeInBytes());
         executeOnBlobStore(repository, blobStore -> {
             blobStore.writeBlob(randomPurpose(), blobName, blobBytes, true);
             return null;