Need help with Elasticsearch query

Elastic Stack Elasticsearch
4 
This works.
    {
  "query": {
    "bool": {
      "must": [
        {
        "bool": {
          "should": [
            { "term" : { "keywords" : "google" } },
            { "term" : { "keywords" : "microsoft" } },
            { "term" : { "keywords" : "tesla" } }
          ],
          "minimum_should_match": 1, 
          "must": [
            { "range": { 
                "@timestamp": {
                  "gte": "now-5d/d",
                  "lte": "now",
                  "format": "date_optional_time"
                } 
              } 
            }
          ]
        }}
      ]
    }
  },
  "aggs": {
         "uniq_uuids": {
             "terms": {
                 "field": "user_uuid.keyword",
                 "size": 10000
             }
         }
     }
}

But when I try to add another bool inside must array, it returns zero hits. See below:

POST _search
{
  "query": {
    "bool": {
      "must": [
        {
        "bool": {
          "should": [
            { "term" : { "keywords" : "google" } },
            { "term" : { "keywords" : "microsoft" } },
            { "term" : { "keywords" : "tesla" } }
          ],
          "minimum_should_match": 1, 
          "must": [
            { "range": { 
                "@timestamp": {
                  "gte": "now-5d/d",
                  "lte": "now",
                  "format": "date_optional_time"
                } 
              } 
            }
          ]
        }},
        {"bool": {
          "should": [
            { "term" : { "keywords" : "apple" } },
            { "term" : { "keywords" : "youtube" } },
            { "term" : { "keywords" : "spotify" } }
          ],
          "minimum_should_match": 1, 
          "must": [
            { "range": { 
                "@timestamp": {
                  "gte": "now-9d/d",
                  "lte": "now",
                  "format": "date_optional_time"
                } 
              } 
            }
          ]
        }}
      ]
    }
  },
  "aggs": {
         "uniq_uuids": {
             "terms": {
                 "field": "user_uuid.keyword",
                 "size": 10000
             }
         }
     }
}