Elasticsearch: Class Cast Exception Scala API - scala

Question

I have been using ES 5.6 and the aggregation queries are working
fine. Recently, we upgraded our ES to 7.1 and it has resulted in a
ClassCastException for one of the queries. I'm posting the ES Index
mapping along with the Scala code and ES query that is resulting in
the exception.
Mapping:
{
"orgs": {
"mappings": {
"org": {
"properties": {
"people": {
"type": "nested",
"properties": {
"email": {
"type": "keyword"
},
"first_name": {
"type": "text",
"fields": {
"raw": {
"type": "keyword"
}
}
},
"last_name": {
"type": "text",
"fields": {
"raw": {
"type": "keyword"
}
}
},
"pcsi": {
"type": "keyword"
},
"position": {
"type": "text",
"fields": {
"raw": {
"type": "keyword"
}
}
},
"position_type": {
"type": "keyword"
},
"source_guid": {
"type": "keyword"
},
"source_lni": {
"type": "keyword"
},
"suffix": {
"type": "keyword"
}
}
}
}
}
}
}
}
Scala Query:
baseQuery.aggs(nestedAggregation("people", OrganizationSchema.People)
.subAggregations(termsAgg("positiontype", "people.position_type")))
Elastic Query:
{"query":{"term":{"_id":{"value":"id"}}},"aggs":{"people":{"nested":{"path":"people"},"aggs":{"positiontype":{"terms":{"field":"people.position_type"}}}}}}
response:
{
"took": 0,
"timed_out": false,
"_shards": {
"total": 6,
"successful": 6,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 0,
"hits": []
},
"aggregations": {
"people": {
"doc_count": 52,
"positiontype": {
"doc_count_error_upper_bound": 0,
"sum_other_doc_count": 0,
"buckets": [
{
"key": "Board Member",
"doc_count": 28
},
{
"key": "Executive",
"doc_count": 22
},
{
"key": "Others",
"doc_count": 2
}
]
}
}
}
}
Scala code:
def getOrganizationPeopleFilters(client: ElasticClient, entityType: String, entityId: String, request: Option[PostFilterApiRequest], baseQuery: SearchRequest): IO[PostFilters] = {
val q = baseQuery.aggs(nestedAggregation("people", OrganizationSchema.People)
.subAggregations(termsAgg("positiontype", "people.position_type")))
client.execute {
q
}.flatMap { res ⇒
esToJsonOrganizationPeopleFilters(res.result)
}
}
The ES query is running and aggregating correctly in Kibana. But, when we are trying to FlatMap the response in the above Scala api code, it is resulting in a ClassCastException (java.lang.ClassCastException: scala.collection.immutable.Map$Map2 cannot be cast to java.lang.Integer)