Elastic Search high level client not encoding + symbol properly in Get Request

[vikaslinux]

Elasticsearch version (bin/elasticsearch --version): 6.3.0

Plugins installed: [Kibana, Cerebro]

JVM version (java -version): 1.8

OS version (uname -a if on a Unix-like system): Linux kernel 4.9.93-0.1 #1 SMP Thu Jun 21 13:50:19 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Description of the problem including expected versus actual behavior:

Steps to reproduce:
Use rest high level client and

where document id is any document id which contains "+" symbol.
GetRequest getRequest = new GetRequest(index, type, documentId);

    GetResponse getResponse = restHighLevelClient.get(getRequest);

Please include a minimal but complete recreation of the problem, including
(e.g.) index creation, mappings, settings, query etc. The easier you make for
us to reproduce it, the more likely that somebody will take the time to look at it.

1. Create any index and any type
2. Index a document with document id that contains "+"
3. Search with the above provided code
4. You should not find the document with an id that includes "+"

Provide logs (if relevant):

[elasticmachine]

Pinging @elastic/es-core-infra