DOC-12351 Add or Remove Services and Rebalance

[rao-shwe]

DOC-12351

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Main content changes:

• What's New entry.
• Added new content and rewrote existing content in Services. - Learn section.
• New page - Adding or Removing the Data Service on Existing Nodes. - Manage section.
• New page - Modify Services and Rebalance. - Manage section.
• New page - Assigning Services on an Existing Node. - REST API section.
• New page - Getting Memory Information. - REST API section.

Updated the following pages to mention add/remove services:

• Learn section
  -- Nodes.
  -- Data Service.
  -- Query Service.
  -- Index Service.
  -- Search Service.
  -- Analytics Service.
  -- Eventing Service.
  -- Backup Service.
• Manage section - Manage Nodes and Clusters.
• REST API section
  -- Initializing a Cluster.
  -- Initializing a Node.
  -- Establishing Credentials.
  -- Naming a Node.
  -- Configuring Memory.
  -- Naming a Cluster.
  -- Assigning Services to a New Node.
  -- Adding Nodes to Clusters.
  -- Rebalancing the Cluster.

[hyunjuV]

@rao-shwe
Just a few additional changes.

[hyunjuV]

@rao-shwe
I suggested a name change for the new page you added -- the "Manage Data Service and Rebalance" is too broad (will be confusing) for the narrow topic. Anyways, the rest look good, so I'll approve. Thanks for all the links/references changes and updates, as well as the core feature documentation -- I think that people will appreciate the effort when they can find the info they need easily.

[sarahlwelton]

Let me know if you want to discuss any of these changes. Please make sure you're running Vale either while you're writing, or before opening a PR.

[sarahlwelton]

Suggested change

	* Couchbase Server Web Console during node-addition and node-joining, see the demonstrated uses of checkboxes, in xref:manage:manage-nodes/add-node-and-rebalance#arbiter-node-addition[Add a Node and Rebalance] and in xref:manage:manage-nodes/join-cluster-and-rebalance#arbiter-node-join[Join a Cluster and Rebalance].
	* The Couchbase Server Web Console during node-addition and node-joining, see xref:manage:manage-nodes/add-node-and-rebalance#arbiter-node-addition[Add a Node and Rebalance] and xref:manage:manage-nodes/join-cluster-and-rebalance#arbiter-node-join[Join a Cluster and Rebalance].

[sarahlwelton]

This is very hard to follow, since UI and CLI are both links. Are users supposed to use the last link, or click on UI and CLI individually? Can you take a different approach, here?

[sarahlwelton]

Suggested change

	For more information about:
	* Initializing a cluster, see xref:manage:manage-nodes/create-cluster.adoc[Create a Cluster].
	* Joining or adding a new node to a cluster, see xref:manage:manage-nodes/join-cluster-and-rebalance.adoc[Join a Cluster and Rebalance] and see xref:manage:manage-nodes/add-node-and-rebalance.adoc[Add a Node and Rebalance].
	* Adding or removing services on an existing node of a cluster, see xref:manage:manage-nodes/modify-services-and-rebalance.adoc[Modify Services and Rebalance].
	* How to run analytic queries, see the xref:analytics:introduction.adoc[Introduction] to Couchbase Analytics.
	For more information about:
	* How to initialize a cluster, see xref:manage:manage-nodes/create-cluster.adoc[Create a Cluster].
	* How to join or add a new node to a cluster to support the Analytics Service, see xref:manage:manage-nodes/join-cluster-and-rebalance.adoc[Join a Cluster and Rebalance] and see xref:manage:manage-nodes/add-node-and-rebalance.adoc[Add a Node and Rebalance].
	* How to add or remove services on an existing node of a cluster, see xref:manage:manage-nodes/modify-services-and-rebalance.adoc[Modify Services and Rebalance].
	* How to run analytic queries, see the xref:analytics:introduction.adoc[Introduction] to Couchbase Analytics.

[sarahlwelton]

Suggested change

	* For information about adding or removing an Analytics Service on an existing node of a cluster, see xref:manage:manage-nodes/modify-services-and-rebalance.adoc[Modify Services and Rebalance].
	* For more information about adding or removing the Analytics Service on an existing node of a cluster, see xref:manage:manage-nodes/modify-services-and-rebalance.adoc[Modify Services and Rebalance].

[sarahlwelton]

Suggested change

	* For information about adding or removing a Backup Service on an existing node of a cluster, see xref:manage:manage-nodes/modify-services-and-rebalance.adoc[Modify Services and Rebalance].
	* For more information about adding or removing the Backup Service on an existing node of a cluster, see xref:manage:manage-nodes/modify-services-and-rebalance.adoc[Modify Services and Rebalance].

[sarahlwelton]

Suggested change

	For illustration, consider 5 nodes in the cluster with the following services:
	* 172.23.108.69 – Data, Index, Query
	* 172.23.108.70 – Data, Search, Query
	* 172.23.108.71 – Query
	* 172.23.108.72 – Backup
	* 172.23.108.73 – Analytics
	Reconfigure the services on the existing nodes so that the following is the required output of services on each of the 5 nodes:
	* 172.23.108.69 – Data, Query
	* 172.23.108.70 – Data, Index
	* 172.23.108.71 – Index, Query
	* 172.23.108.72 – Search, Query
	* 172.23.108.73 – Analytics
	For example, a cluster with 5 nodes could have the following service configuration:
	* 172.23.108.69 – Data, Index, Query
	* 172.23.108.70 – Data, Search, Query
	* 172.23.108.71 – Query
	* 172.23.108.72 – Backup
	* 172.23.108.73 – Analytics
	You could reconfigure the services on the existing nodes to match the following:
	* 172.23.108.69 – Data, Query
	* 172.23.108.70 – Data, Index
	* 172.23.108.71 – Index, Query
	* 172.23.108.72 – Search, Query
	* 172.23.108.73 – Analytics

[sarahlwelton]

Suggested change

	Run the following command to reconfigure the services on the existing nodes and get the required output.
	To reconfigure the 5 nodes to the new topology, run the following command:

[sarahlwelton]

Suggested change

	* For information about allocating memory per service, see xref:rest-api:rest-configure-memory.adoc[Configuring Memory].
	* To fetch the details of current memory allocation for each service, see xref:rest-api:rest-get-memory-information.adoc[Getting Memory Information].
	* For information about assigning services to existing nodes from the UI and CLI, see xref:manage:manage-nodes/modify-services-and-rebalance.adoc[Modify Services and Rebalance].
	* For information about assigning services to a new node, see xref:rest-api:rest-set-up-services.adoc[Assigning Services to a New Single Node].
	* For information about rebalancing, see xref:rest-api:rest-cluster-rebalance.adoc[Rebalancing the Cluster].
	* For more information about allocating memory per service, see xref:rest-api:rest-configure-memory.adoc[Configuring Memory].
	* To fetch the details of current memory allocation for each service, see xref:rest-api:rest-get-memory-information.adoc[Getting Memory Information].
	* For more information about assigning services to existing nodes from the UI and CLI, see xref:manage:manage-nodes/modify-services-and-rebalance.adoc[Modify Services and Rebalance].
	* For more information about assigning services to a new node, see xref:rest-api:rest-set-up-services.adoc[Assigning Services to a New Single Node].
	* For more information about rebalancing, see xref:rest-api:rest-cluster-rebalance.adoc[Rebalancing the Cluster].

[sarahlwelton]

Suggested change

	* The sequence of tasks divided into _initialization_ and _provisioning_ is explained in xref:rest-api:rest-cluster-init-and-provisioning.adoc[Cluster Initialization and Provisioning].
	* For more information about cluster initialization and provisioning with the REST API, see xref:rest-api:rest-cluster-init-and-provisioning.adoc[Cluster Initialization and Provisioning].

[sarahlwelton]

Suggested change

	* For further information on initialization and provisioning -- using the UI, the CLI, and the REST API -- see xref:manage:manage-nodes/node-management-overview.adoc[Manage Nodes and Clusters].
	* For information about assigning non-Data Services to an existing node using the REST API, see xref:rest-api:rest-set-up-services-existing-nodes.adoc[Assigning Services to an Existing Node].
	* For more information on initialization and provisioning -- using the UI, the CLI, and the REST API -- see xref:manage:manage-nodes/node-management-overview.adoc[Manage Nodes and Clusters].
	* For more information about assigning non-Data Services to an existing node using the REST API, see xref:rest-api:rest-set-up-services-existing-nodes.adoc[Assigning Services to an Existing Node].