[FEATURE] Opensearch 2.7.x client documentation improvements

[firatsivrikaya]

Is your feature request related to a problem?

While I have been checking the documentation of opensearch clients for 2.7.x on Java client - OpenSearch documentation I have seen that some of the examples (eg Java client - OpenSearch documentation) are using
org.apache.hc.client5 and org.apache.hc.core5 packages, but sample program on Java client - OpenSearch documentation is done with org.apache.http. packages.

What solution would you like?

Documentation should state that I need a additional third party dependencies to run the example which uses the hc packages.
Also, It would be good if we could see a complete example on the create client part of the developer guide for each versions.
opensearch-java/USER_GUIDE.md at main · opensearch-project/opensearch-java · GitHub

What alternatives have you considered?

Do you have any additional context?

Version : OpenSearch 2.7.x
OS Forum Question Link : https://forum.opensearch.org/t/opensearch-2-7-x-client-documentation/14424
implementation ‘org.opensearch.client:opensearch-rest-client:2.7.0’
implementation ‘org.opensearch.client:opensearch-java:2.4.0’

PS: There is an extra space on documentation of gradle script (between rest-client and 2.7.0 parts)
dependencies {
implementation 'org.opensearch.client:opensearch-rest-client: 2.7.0'
implementation 'org.opensearch.client:opensearch-java:2.4.0'
}

Thanks!

[reta]

I believe the documentation snippet for 2.x line includes RestClient usage for OpenSearch 3.x line, I will fix that