Bug: fix(opensearch): fix empty filter array query addition in globalsearch query



Fix the opensearch query building, when free-text query is empty, no case-sensitive filters are passed and time-range is also not mentioned 
diff --git a/crates/analytics/src/opensearch.rs b/crates/analytics/src/opensearch.rs
index e8726840a2e..246a0f4e8bb 100644
--- a/crates/analytics/src/opensearch.rs
+++ b/crates/analytics/src/opensearch.rs
@@ -705,9 +705,7 @@ impl OpenSearchQueryBuilder {
 
         let should_array = self.build_auth_array();
 
-        if !bool_obj.is_empty() {
-            query_obj.insert("bool".to_string(), Value::Object(bool_obj));
-        }
+        query_obj.insert("bool".to_string(), Value::Object(bool_obj));
 
         let mut sort_obj = Map::new();
         sort_obj.insert(

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
The opensearch query should be built manually in the code, based on the request body.
There is a component called `filter_array` which comprises of the free-text search query, addition of case sensitive filters and also the time_range (if provided).
When all the three sub parts are empty (empty query string, no case-sensitive filters and missing time_range) in the request, the filter_array will not be created, and the logic for integrating the rest of the filters is affected.

Making minor fixes to the query builder to update the opensearch query even if all the above mentioned components are empty.

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
<!--
Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
-->
Give out correct results by building the opensearch query through the request body.

## How did you test it?
<!--
Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
-->
Should test the case when free-text query is empty, case-sensitive filters are not provided, and time-range filter is also not applied.
Hit the curl:
```bash
curl --location 'http://localhost:8080/analytics/v1/search' \
--header 'sec-ch-ua-platform: "macOS"' \
--header 'authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjoiNTQ5ZTNkMmItMTY5Yi00NzUzLWJmNTQtZDcxMTM2YjRiN2JkIiwibWVyY2hhbnRfaWQiOiJtZXJjaGFudF8xNzI2MDQ2MzI4Iiwicm9sZV9pZCI6Im9yZ19hZG1pbiIsImV4cCI6MTczMzI5ODcwMywib3JnX2lkIjoib3JnX1ZwU0hPanNZZkR2YWJWWUpnQ0FKIiwicHJvZmlsZV9pZCI6InByb192NXNGb0hlODBPZWlVbElvbm9jTSIsInRlbmFudF9pZCI6InB1YmxpYyJ9.y9FI-AvvzNKd4DbJiGT7LmwfzxNjZDdOZfQ40TGTh3w' \
--header 'Referer: http://localhost:9000/' \
--header 'sec-ch-ua: "Google Chrome";v="129", "Not=A?Brand";v="8", "Chromium";v="129"' \
--header 'sec-ch-ua-mobile: ?0' \
--header 'api-key: dev_LZcIA7XeMpnK5satp4CDvjcnHCaeKTBcosyuBBJaknZu1odhFo96cwS0nSdfzuJF' \
--header 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36' \
--header 'Content-Type: application/json' \
--data '{
    "query": "",
    "filters": {
        "currency": [
            "USD"
        ]
    }
}'
```

The response should now give out all the results based on the filter applied.

Sample opensearch query structure:
```json
{
  "query": {
    "bool": {
      "must": [
        {
          "bool": {
            "must": [
              {
                "bool": {
                  "should": [
                    {
                      "term": {
                        "currency.keyword": {
                          "value": "USD",
                          "case_insensitive": true
                        }
                      }
                    }
                  ],
                  "minimum_should_match": 1
                }
              }
            ]
          }
        },
        {
          "bool": {
            "must": [
              {
                "bool": {
                  "should": [
                    {
                      "bool": {
                        "must": [
                          {
                            "term": {
                              "organization_id.keyword": {
                                "value": "org_VpSHOjsYfDvabVYJgCAJ"
                              }
                            }
                          }
                        ]
                      }
                    }
                  ],
                  "minimum_should_match": 1
                }
              }
            ]
          }
        }
      ]
    }
  },
  "sort": [
    {
      "@timestamp": {
        "order": "desc"
      }
    }
  ]
}
```

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
