test.pl

use Search::Elasticsearch;

my $e = Search::Elasticsearch->new( trace_to => 'Stderr' );

my %blogpost = (
    title   => "My first blogpost",
    author  => 'Clint',
    content => 'blah blah blah'
);

my @comments = (
    { author => 'John', comment => 'Nice blogpost' },
    { author => 'Mary', comment => 'Awesome work' }
);

$blogpost{comments} = \@comments;

# delete the index in case it exists
$e->indices->delete( index => 'website', ignore => 404 );

# now create the index with the `nested` mapping
$e->indices->create(
    index => 'website',
    body  => {
        mappings => {
            blogpost => {
                properties => {
                    title    => { type => 'string' },
                    author   => { type => 'string' },
                    comments => {
                        type       => 'nested',
                        properties => {
                            author  => { type => 'string' },
                            comment => { type => 'string' }
                        }
                    }
                }
            }
        }
    }
);

$e->index(
    index => 'website',
    type  => 'blogpost',
    id    => 1,
    body  => \%blogpost
);
$e->indices->refresh;    # otherwise you have to wait 1 second

my $results = $e->search(
    index => 'website',
    body  => {
        query => {
            bool => {
                must => [
                    { match => { title => 'first blogpost' } },
                    {   nested => {
                            path  => 'comments',
                            query => {
                                bool => {
                                    must => [
                                        {   match =>
                                                { "comments.author" => 'john' }
                                        },
                                        {   match => {
                                                "comments.comment" => 'nice'
                                            }
                                        },
                                    ]
                                }
                            }
                        }
                    }
                ]
            }
        }
    }
);