Search Guard With Spring Data ES

Question

I followed steps mentioned here to secure my local ES installation using SearchGuard (no tag exist for it on SO). Now, it is reachable via Postman only through basic authentication with username password as default admin/admin.

Now, I need to allow my Spring Data ES project to be able to access this ES installation.

I tried:

Settings esSettings = Settings.settingsBuilder()
            .put("path.home", ".")
            .put("cluster.name", clusterName)
            .put("searchguard.ssl.transport.enabled", true)
            .put("searchguard.ssl.transport.keystore_filepath", "kirk-keystore.jks")
            .put("searchguard.ssl.transport.truststore_filepath", "truststore.jks")
            .put("searchguard.ssl.transport.enforce_hostname_verification", false)
            .put("request.headers.sg.impersonate.as", "admin")
            .build();

TransportClient client = TransportClient.builder().settings(esSettings)
            .build().addTransportAddress(
            new InetSocketTransportAddress(InetAddress.getByName(elasticsearchHost), elasticsearchPort));

client.prepareGet().putHeader("Authorization", "Basic " + Base64.encodeBase64("admin:admin".getBytes())).get();

return client;

Added header as suggested here.

But all I get is:

[elasticsearch[Meteorite][generic][T#3]] INFO  org.elasticsearch.client.transport - 
[Meteorite] failed to get node info for {#transport#-1}{127.0.0.1}{127.0.0.1:9300}, disconnecting...
org.elasticsearch.transport.NodeDisconnectedException: [][127.0.0.1:9300][cluster:monitor/nodes/liveness] disconnected

I need to get and post new data in ES (2.4.4).