Elasticsearch indexing_pressure metric not in the monitoring mapping

[sachin-frayne]

Describe the enhancement:

Add the missing fields related to indexing_pressure into the mapping located in the Elasticsearch repo: https://github.com/elastic/elasticsearch/blob/main/x-pack/plugin/core/template-resources/src/main/resources/monitoring-es-mb.json

Example values:

...
                "indexing_pressure": {
                  "memory": {
                    "total": {
                      "primary": {
                        "rejections": 0,
                        "bytes": 239335086
                      },
                      "coordinating": {
                        "rejections": 0,
                        "bytes": 220495904
                      },
                      "replica": {
                        "rejections": 0,
                        "bytes": 0
                      },
                      "combined_coordinating_and_primary": {
                        "bytes": 220495904
                      },
                      "all": {
                        "bytes": 220495904
                      }
                    },
                    "limit_in_bytes": 27682406,
                    "current": {
                      "coordinating": {
                        "bytes": 0
                      },
                      "replica": {
                        "bytes": 0
                      },
                      "combined_coordinating_and_primary": {
                        "bytes": 0
                      },
                      "all": {
                        "bytes": 0
                      },
                      "primary": {
                        "bytes": 0
                      }
                    }
                  }
                },
...

Since they are all bytes, the field type, long should work.

Describe a specific use case for the enhancement or feature:

To search through the fields they need to be in the mapping.