Amplify Geolocation aware search not working

Question

I am trying to integrate GeoLocation aware searching via AWS OpenSearch in Amplify dynamoDB graphQL. OpenSearch Instance that created using amplify cli i followed these steps to achieve geolocation wise items list from dynamoDB

Failed to receive data accroding to geolocation.

Schema.graphql

type User
  @model
  @searchable {
  id: ID!
  full_name: String
  email: String
  phoneNumber: String
  location: Location
}

type Query {
  nearbyUsers(
    location: LocationInput!, 
    m: Int #Radius | Distance criteria to get users under perimeter
 ): NearbyUserConnection
}

type NearbyUserConnection {
 items: [User]
 total: Int
 nextToken: String
}

type Location {
  lat: Float
  lon: Float
}

Query.nearbyusers.req.vtl

## Query.nearbyUsers.req.vtl
## Objects of type User will be stored in the /bikepoint index

#set( $indexPath = "/user/doc/_search" )
#set( $distance = $util.defaultIfNull($ctx.args.m, 500) )
#set( $limit = $util.defaultIfNull($ctx.args.limit, 10) )
{
  "version": "2017-02-28",
  "operation": "GET",
  "path": "$indexPath.toLowerCase()",
  "params": {
    "body": {
      "from" : 0, 
      "size" : ${limit},
      "query": {
        "bool" : {
          "must" : {
            "match_all" : {}
          },
          "filter" : {
            "geo_distance" : {
              "distance" : "${distance}m",
              "pin.location" : $util.toJson($ctx.args.location)
            }
          }
        }
      },
      "sort": [{
        "_geo_distance": {
          "location": $util.toJson($ctx.args.location),
          "order": "asc",
          "unit": "m",
          "distance_type": "arc"
        }
      }]
    }
  }
}```

**opensearch Error Logs**

> [**,958][DEBUG][o.e.a.s.TransportSearchAction] [****] [****][user][0]:
> Failed to execute [SearchRequest{searchType=QUERY_THEN_FETCH,
> indices=[user],
> indicesOptions=IndicesOptions[ignore_unavailable=false,
> allow_no_indices=true, expand_wildcards_open=true,
> expand_wildcards_closed=false, expand_wildcards_hidden=false,
> allow_aliases_to_multiple_indices=true, forbid_closed_indices=true,
> ignore_aliases=false, ignore_throttled=true], types=[doc],
> routing='null', preference='null', requestCache=null, scroll=null,
> maxConcurrentShardRequests=0, batchedReduceSize=512,
> preFilterShardSize=null, allowPartialSearchResults=true,
> localClusterAlias=null, getOrCreateAbsoluteStartMillis=-1,
> ccsMinimizeRoundtrips=true,
> source={"size":10,"query":{"bool":{"must":[{"match_all":{"boost":1.0}}],"filter":[{"geo_distance":{"location":[**],"distance":10.0,"distance_type":"arc","validation_method":"STRICT","ignore_unmapped":false,"boost":1.0}}],"adjust_pure_negative":true,"boost":1.0}}},
> cancelAfterTimeInterval=null}] lastShard [true]
> RemoteTransportException[[****][__IP__][__PATH__[__PATH__]]]; nested:
> QueryShardException[failed to find geo_point field [location]];