Yaushe za a yi amfani da text, keyword ko duka biyu?

Question

IT Interview Practice · Accepted Answer

Yi amfani da `text` idan kana son nemo kalmomi cikin wata ƙima. Yi amfani da `keyword` idan kana buƙatar cikakkiyar ƙimar don filtering, sorting ko grouping.

## Kwatanta take ɗaya

Ka yi tunanin taken samfur `Blue Shoes`. Idan analyzer yana raba kalmomi kuma yana sauya su zuwa ƙananan haruffa, zai samar da `blue` da `shoes`. Binciken `shoes` zai iya gano taken.

Sigar keyword tana riƙe ƙimar a matsayin term ɗaya, bisa normalizer da aka saita idan akwai. Tana da amfani wajen neman cikakken take ko haɗa kayayyaki bisa wannan ƙimar.

## Tallafa wa ayyukan biyu

Wannan ɓangaren mapping yana bayyana wakilcin indexed guda biyu:

```json
{
  "properties": {
    "title": {
      "type": "text",
      "fields": { "raw": { "type": "keyword" } }
    }
  }
}
```

Nemi kalmomi a `title`; yi sorting ko aggregation na cikakkun taken a `title.raw`. Multi-field yana nufin indexing na input ɗaya ta hanyoyi fiye da ɗaya, ba aika kwafi biyu a kowane document ba.

## Ka zaɓi ƙarin kuɗin da gangan

Sigar biyu suna buƙatar indexing da storage. Ga status kamar `published`, keyword shi kaɗai na iya isa. Don grouping na cikakkun taken, fifita keyword field maimakon kunna text fielddata, wanda yake loda analyzed terms don irin ayyukan kuma zai iya cin memory mai yawa.

[Takardun hukuma](https://www.elastic.co/docs/reference/elasticsearch/mapping-reference/text).

Kwatanta take ɗaya

Tallafa wa ayyukan biyu

Ka zaɓi ƙarin kuɗin da gangan

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