Add Completion Suggester and reindex, no data

Elastic Stack Elasticsearch
1

I have a mapping like this, and i have already added data and indexed.
{"mappints":{
"properties": {
"type": "object",
"properties": {
"occupation": {
"type": "text"
},
"skill": {
"type": "text",
}
}}

And right now I want to add suggester like this:

{"mappints":{
"properties": {
"type": "object",
"properties": {
"occupation": {
"type": "text"
},
"skill": {
"type": "text",
},
"suggest": {
"type": "completion"
}
}}

And the I re indexed all the data, but suggest have no any data, I know the official docs gave info, that you need to populate your data, but when I add the suggest into attribute, like this.
{"mappints":{
"properties": {
"type": "object",
"properties": {
"occupation": {
"type": "text",
"fields": {
"raw": {
"type": "keyword",
"ignore_above": 256
},
"suggest": {
"type": "completion"
}
},
"skill": {
"type": "text",
"fields": {
"raw": {
"type": "keyword",
"ignore_above": 256
},
"suggest": {
"type": "completion"
}
}
}}

like this, and indexed, I do not populate any data, you could search data inside that?

Can you explain why?

what is the different between this two???
(coz official docment is not clear)

2

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