[BUG] [2.15]: Nested/Object Field Arrays Display Incorrectly

[rayangou]

Describe the bug

In OpenSearch Dashboards, the first object in a nested field array incorrectly displays all array values from adjacent objects. This issue does not occur when querying OpenSearch directly.

To Reproduce
Steps to reproduce the behavior:

1. Create an index test-nested-array with the following mapping:

"nested_test1": {
  "type": "nested",
  "properties": {
    "d_values": {
      "type": "double"
    },
    "s_entry": {
      "type": "keyword"
    }
  }
}

2. Add documents like the one below:

{
  "nested_test1": [
    {
      "d_values": [0.1, 0.2],
      "s_entry": "4"
    },
    {
      "d_values": [0.3, 0.4],
      "s_entry": "5"
    },
    {
      "d_values": [0.5, 0.6],
      "s_entry": "6"
    }
  ]
}

3. Go to OpenSearch Dashboards and create an index pattern for the test-nested-array index.
4. Expand the record and click on the JSON view.
5. Observe that the first object in the nested_test1 array displays all the array values of its adjacent objects.
6. Example of the observed behavior:

"nested_test1": [
  {
    "d_values": [
      [0.1, 0.2],
      [0.3, 0.4],
      [0.5, 0.6]
    ],
    "s_entry": "1"
  },
  {
    "d_values": [0.3, 0.4],
    "s_entry": "2"
  },
  {
    "d_values": [0.5, 0.6],
    "s_entry": "3"
  }
]

Expected behavior
The first object in the nested_test1 array should not include values from adjacent objects. The expected output is:

"nested_test1": [
  {
    "d_values": [0.1, 0.2],
    "s_entry": "1"
  },
  {
    "d_values": [0.3, 0.4],
    "s_entry": "2"
  },
  {
    "d_values": [0.5, 0.6],
    "s_entry": "3"
  }
]

OpenSearch Version
2.15

Dashboards Version
2.15

Plugins

Security, Alerting,

Screenshots

Host/Environment (please complete the following information):

• OS: CentOS
• Browser and version Chrome

Additional context

This issue appears to be specific to OpenSearch Dashboards handling of nested/Object array fields in the JSON view.