Add node.stats.indices.shard_stats.total_count to monitoring-es-mb template

[renshuki]

Resolves #114470

Also as mentioned in #114470:

I can see there was this PR (#107471) and the ES side to add the field to the monitor mappings. However, I can see it was added as cluster_stats.indices.shards_stats.total_count, not elasticsearch.node.stats.indices.shard_stats.total_count. Is it a mistake?

I don't see this field (cluster_stats.indices.shards_stats.total_count) being used anywhere in the monitoring data.

and it seems to overlap with cluster_stats.indices.shards.total:

elasticsearch/x-pack/plugin/core/template-resources/src/main/resources/monitoring-es-mb.json

Lines 2366 to 2385 in fd40f8b

	"shards_stats": {
	"properties": {
	"total_count": {
	"type": "long"
	}
	}
	},
	"shards": {
	"properties": {
	"total": {
	"path": "elasticsearch.cluster.stats.indices.shards.count",
	"type": "alias"
	}
	}
	},
	"count": {
	"path": "elasticsearch.cluster.stats.indices.total",
	"type": "alias"
	}
	}

If you can confirm that cluster_stats.indices.shards_stats.total_count is not used, I don't mind adding a commit to remove it.