[data.search] track_total_hits=true being sent in search request

[lukasolson]

Kibana version: 9.1.0

Describe the bug:

The data.search APIs are sending track_total_hits=true in search requests, even when the consumer passes track_total_hits=false. This started in #208776.

Steps to reproduce:

1. Add the following to the yml to log Elasticsearch requests:

logging:
  loggers:
    - name: elasticsearch.query
      level: debug

2. Open Discover & let it load
3. Open the Inspect dialog, select the "Documents" view, and select the "Request" view

Notice that the request contains track_total_hits=false. However if you find the corresponding request in the Kibana server logs, it shows that the actual request being sent to Elasticsearch contains track_total_hits=true.

Expected behavior:

1. The inspector shows the actual request that is being sent to ES (right now it isn't)
2. track_total_hits=false is properly being forwarded to the server & sent to ES

Any additional context:

It looks like the following code is not properly getting the track_total_hits parameter from the client:

kibana/src/platform/plugins/shared/data/server/search/strategies/es_search/request_utils.ts

Line 21 in 52ab19d

export async function getDefaultSearchParams(

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)