Optimising node to node communication by serializing node attribute in DiscoveryNode only in scenarioes where it is required

[RS146BIJAY]

Description

A significant amount of compute and memory goes into ser/de during node to node communications for DiscoveryNode containing a bunch of node properties and attributes which are largely static and doesn't need to passed around for most of the node to node communication. Further, in scenarios like NodeStats call or FollowerChecker requests, single master thread needs to broadcast this DiscoveryNode object containing all these attributes to all the nodes of cluster. In case cluster is very large, this becomes a major bottleneck for master transport thread (which handles other critical operation like ClusterStateUpdate, IndexCreate etc,), which remains blocked till DiscoveryNode object is written.

In this PR we propose to optimise this node to node communication by serializing node attributes in DiscoveryNode only in scenarioes where it is required.

We are serialising attributes in the following scenarioes:

1. Cluster state publication
2. JoinRequest
3. Cluster Allocation Explanation request
4. Start Recovery
5. HandShake Request

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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❌ Gradle check result for b2d6402: FAILURE

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❕ Gradle check result for c2a85c3: UNSTABLE

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[Bukhtawar]

How can we verify that REST API call responses don't break?

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❕ Gradle check result for ca25f58: UNSTABLE

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[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/OpenSearch/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch/backport-2.x
# Create a new branch
git switch --create backport/backport-15341-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 451606535752a73be80d5203ae417e7d57fc5cef
# Push it to GitHub
git push --set-upstream origin backport/backport-15341-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-15341-to-2.x.