### Elasticsearch Version

7.17.5

### Installed Plugins

_No response_

### Java Version

18.0.1.1

### OS Version

3.10.0-1160.76.1.el7.x86_64 

### Problem Description

[https://discuss.elastic.co/t/why-conf-dfs-replication-1-is-not-success/316405](url)

conf.dfs.replication = 1 is not be used


 protected HdfsBlobStore createBlobStore() {
        // initialize our blobstore using elevated privileges.
        SpecialPermission.check();
        final HdfsBlobStore blobStore = AccessController.doPrivileged(
            (PrivilegedAction<HdfsBlobStore>) () -> createBlobstore(uri, pathSetting, getMetadata().settings())
        );

     final Settings confSettings = repositorySettings.getByPrefix("conf.");
        for (String key : confSettings.keySet()) {
            logger.debug("Adding configuration to HDFS Client Configuration : {} = {}", key, confSettings.get(key));
            hadoopConfiguration.set(key, confSettings.get(key));
        }




### Steps to Reproduce

snapshots

### Logs (if relevant)

_No response_
plugins/repository-hdfs/src/test/java/org/elasticsearch/repositories/hdfs/HdfsTests.java
clusterAdmin().preparePutRepository("test-repo").setType("hdfs").setSettings(Settings.EMPTY).get();
            fail();
        } catch (RepositoryException e) {
            assertTrue(e.getCause() instanceof IllegalArgumentException);
            assertTrue(e.getCause().getMessage().contains("No 'uri' defined for hdfs"));
        }
    }
    public void testEmptyUri() {
        try {
            clusterAdmin().preparePutRepository("test-repo")
                .setType("hdfs")
                .setSettings(Settings.builder().put("uri", "/path").build())
                .get();
            fail();
        } catch (RepositoryException e) {
            assertTrue(e.getCause() instanceof IllegalArgumentException);
            assertTrue(e.getCause().getMessage(), e.getCause().getMessage().contains("Invalid scheme [null] specified in uri [/path]"));
        }
    }
    public void testNonHdfsUri() {
        try {
            clusterAdmin().preparePutRepository("test-repo")
                .setType("hdfs")
                .setSettings(Settings.builder().put("uri", "file:///").build())
                .get();
            fail();
        } catch (RepositoryException e) {
            assertTrue(e.getCause() instanceof IllegalArgumentException);
            assertTrue(e.getCause().getMessage().contains("Invalid scheme [file] specified in uri [file:///]"));
        }