How do I combine fields from 2 different docs (and indices) within Kibana?

Elastic Stack Kibana
3

Hello, thanks for you response. See below for the samples.

Index 1, Clicks:
_id
id number

_index
company_click_out

_score
0

_type
_doc

click_box_title
specific category

click_out_id
click id number

click_price
1.00

clickbox_category_id
366

company_id
1111

company_location_city
Utrecht

company_location_city_keyword
Company A Utrecht

company_location_country
ENG

company_location_geo_point
14.422657, 17.94846

company_location_id
85 642

company_location_name
Franchise A

company_location_postcode
43253

company_name
Company A

created_at
Timefield when the doc is added

day_of_week_keyword
monday

hour_of_day
1

is_free_click_int
0

is_paid_click_int
1

missed_revenue
0,00

monetization_rate
100%

month_keyword
january

number_of_clicks
1

occurrences_times

original_price
1.00

paid_clicks_percentage
100%

parent_category_title
Parent category

type
booking

updated_at
Jan 1, 2020, @ 00:00:00

visit_id
id of the session

visitor_ip_address
ip address of the user

visitor_ip_address_string
ip address of the user in string type

visitor_user_agent
device information of the user

week_number
1

-- Above is index a, Clicks, below this line starts index b, conversions.

Index 2, conversion:

_id
123

_index
company_conversion

_score
0

_type
_doc

clickbox_category_id
123

clickbox_category_name
Category

conversion_id
123

created_at
Jun 4, 2021 @ 14:00:00.000

experiments
{
String with some experimental data
}

offer_date_from
Start date of the offer

offer_date_until
End date of the offer

permanent_visitor_id
27346278_a424b

rental_item_id
1435

rental_item_name
specific item name

rental_service_provider_id
23452

rental_service_provider_location_id
23552

rental_service_provider_location_name
Company A Utrecht

rental_service_provider_name
Franchise A - Company A Utrecht

type
booking

updated_at
Jun 4, 2021 @ 14:00:00.000

visit_id
id of the session

The bold text is the field with some sample data which I would like in the combined doc. These are from the 2 indices, clicks and conversions, both have the field 'visit_id', which might add some possibilities when it comes to combining docs.

Hope this information is an answer to your request and you can help us out!