[2.x] Revert 2.x HttpClient to Apache HttpComponents / Core 4.x #303
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Description
Fixes 2.x build following backport of integ tests #302 which relied on 3.x Http Client 5.
Most changes derived from reverse-diffing opensearch-project/opensearch-sdk-java#345 or multiple other plugin PRs referencing opensearch-project/OpenSearch#4256
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