OpenSearch: [BUG] _cluster/stats API returning incorrect cluster_manager count

Describe the bug _cluster/stats API returns wrong count of nodes with cluster_manager role.

To Reproduce Steps to reproduce the behavior:

1. Create a multi-node cluster on OS 2.3 (I tried it on 2.3), lets say with 3 nodes with cluster_manager role.
2. Check response of _cat/nodes - which should show correct roles of each nodes.

ip         heap.percent ram.percent cpu load_1m load_5m load_15m node.role node.roles                                   cluster_manager name
10.0.3.37            40          77   0    0.00    0.00     0.00 dir       data,ingest,remote_cluster_client            -               data-node
10.0.5.179           45          77   0    0.00    0.00     0.00 dir       data,ingest,remote_cluster_client            -               data-node
10.0.4.180           12          76   0    0.00    0.02     0.01 -         ml                                           -               ml-node
10.0.4.224           41          76   0    0.00    0.00     0.00 mmr       cluster_manager,master,remote_cluster_client -               manager-node
10.0.4.16            37          78   0    0.00    0.00     0.00 dir       data,ingest,remote_cluster_client            -               data-node
10.0.3.181           13          76   0    0.00    0.00     0.00 mmr       cluster_manager,master,remote_cluster_client -               manager-node
10.0.5.122           17          76   0    0.01    0.01     0.00 mmr       cluster_manager,master,remote_cluster_client *               seed

1. Check response of _cluster/stats

.
.
.
"nodes" : {
    "count" : {
      "total" : 7,
      "cluster_manager" : 6,
      "coordinating_only" : 0,
      "data" : 3,
      "ingest" : 3,
      "master" : 6,
      "ml" : 1,
      "remote_cluster_client" : 6
    },
    "versions" : [
      "2.3.0"
    ],
.
.
.

Expected behavior Count of cluster_manager and master should be 3 in above case.

Plugins None

Screenshots None

Host/Environment (please complete the following information):

• Version: 2.3

Additional context The above response was correct till OS 1.3.x