Weighted fields in query string or boost in should clauses

Elastic Stack Elasticsearch
1

Which way is better to accomplish query_string field search in multiple
fields with different weights?

1st way:

{
"query": {
"query_string": {
"query": "cats",
"fields": [
"en_keywords_1^5",
"en_keywords_2^2",
"en_keywords_3"
],
"use_dis_max": true
}
}
}

2nd way:

{
"query": {
"bool": {
"must": [
{
"query_string": {
"query": "cats",
"fields": [
"en_keywords_1",
"en_keywords_2",
"en_keywords_3"
]
}
}
],
"should": [
{
"query_string": {
"query": "cats",
"fields": [
"en_keywords_1"
],
"boost": 5
}
},
{
"query_string": {
"query": "cats",
"fields": [
"en_keywords_2"
],
"boost": 3
}
}

        ]
    }
}

}

and What are pros and cons of both approaches?

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