Bool query should in bool must

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1

I use bool should in bool must query like below.
{
"query":{
"bool":{
"must":[
{
"bool": {
"should":[
{
"match":{
"securityType":"ACCESS"
}
}
]
}
},
{
"match": {
"secuirtyEvent":"Read"
}
}
]
}
}
}

  I want to know default value of minimum_should_match when I use bool should query in bool  must query. Is it one?
3 
I use bool should in bool must query.
"query":{
"bool":{

What ?

4

I am sorry that I was writing a question.