Individual Boost & Search_ Analyzer by Field

Hello,

how can i define individual Boost & Search_ Analyzer by Field (Name,
Content)?

{
"dis_max" : {
"tie_breaker" : 0.7,
"queries" : [
{
"text" : { "name" : "italan food" }
},
{
"text" : { "content" : "italan food" }
}
]
}
}

is this query similar to query_string with use_dismax flag set to
true?

Thanks