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Add primary shard balancing documentation (#3769) 

* Add primary shard balancing documentation

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* Adds default value

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* Update _api-reference/cluster-api/cluster-settings.md

Co-authored-by: Nathan Bower <nbower@amazon.com>

---------

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>
Co-authored-by: Nathan Bower <nbower@amazon.com>
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_api-reference/cluster-api/cluster-settings.md
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@ -92,6 +92,7 @@ The following request field parameters are compatible with the cluster API.
| cluster.routing.allocation.balance.shard | Floating point | Defines the weight factor for the total number of shards allocated per node. Default is `0.45`. |
| cluster.routing.allocation.balance.index | Floating point | Defines the weight factor for the number of shards per index allocated on a node. Default is `0.55`. |
| cluster.routing.allocation.balance.threshold | Floating point | The minimum optimization value of operations that should be performed. Default is `1.0`. |
| cluster.routing.allocation.balance.prefer_primary | Boolean | When set to `true`, OpenSearch attempts to evenly distribute the primary shards between the cluster nodes. Enabling this setting does not always guarantee an equal number of primary shards on each node, especially in the event of failover. Changing this setting to `false` after it was set to `true` does not invoke redistribution of primary shards. Default is `false`.
| cluster.routing.allocation.disk.threshold_enabled | Boolean | When set to `false`, disables the disk allocation decider. This will also remove any existing `index.blocks.read_only_allow_delete index blocks` when disabled. Default is `true`. |
| cluster.routing.allocation.disk.watermark.low | String | Controls the low watermark for disk usage. When set to a percentage, OpenSearch will not allocate shards to nodes with that percentage of disk used. This can also be entered as ratio value, like `0.85`. Finally, this can also be set to a byte value, like `400mb`. This setting does not affect the primary shards of newly-created indexes, but will prevent their replicas from being allocated. Default is `85%`. |
| cluster.routing.allocation.disk.watermark.high | String | Controls the high watermark. OpenSearch will attempt to relocate shards away from a node whose disk usage is above the percentage defined. This can also be entered as a ratio value, like `0.85`. Finally, this can also be set to a byte value, like `400mb`. This setting affects the allocation of all shards. Default is `90%`. |