[BUG] [Region Maps] Zoom in/out/fit to bounds doesn't load data as expected

[VijayanB]

Describe the bug

Region maps doesn't load data properly if iso_2 field is used for join conditions.

To Reproduce
Steps to reproduce the behavior:

1. Execute following request

POST /national_parks/_bulk?refresh
{"index":{"_id":1}}
{"name": "Yellowstone National Park", "location": "USA"}
{"index":{"_id":2}}
{"name": "Yosemite National Park", "location": "MEX"}
{"index":{"_id":3}}
{"name": "Zion National Park", "location": "CAN"}

2. Create an index pattern national_parks
3. Create Region map with index patter national_parks, shape field: location, join field: iso_3_code
4. Zoom in/out
5. You will see warning message that data cannot be loaded

Expected behavior
At step 5, data should be loaded. No error should be visible.

OpenSearch Version
2.6.0

Dashboards Version
2.6.0

Plugins

N/A

Screenshots

https://forum.opensearch.org/t/region-maps-highlights-vanishing-when-clicked-on-the-map-zoom-buttons/13895

Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Browser and version [e.g. 22]

Additional context

Reported in forum

[tejashu7]

Could you please let us know if this issue is tracked or anyone working on this?

[tejashu7]

Is there any update on this issue?

[joshuarrrr]

@tejashu7 This is a confirmed bug, but there's not anyone currently assigned or working on it.

CC @wbeckler