Elastic search must match if type exists

I have this elastic search function that match two conditions.
But now "type" is optional and I want return all cookies if type is not set and if type is set I want the same result as in the query below. Type is an enum (if that matters).

export const searchCookies: HttpFunction = enrichCloudFunction(async (req, res) => {
  const {
    query: { type, cookies, from, size },
  } = validateCookieQuery(req)
  const {
    hits: { hits },
  } = await elastic.search<ExtendedStuff>({
    from: from || 0,
    index: cookieIndex({ prefix: config.prefix }),
    query: {
      bool: {
        must: [
          {
            match: { 'cookie.id': cookie },
          },
          {
            match: { type },
          },
        ],
      },
    },
    size: size || 20,
  })

  res.json(hits.map((x) => x._source))
})

This might be a super trivial thing but this is the first time I am using elastic search and I am super confused.

>Solution :

I would check the Elastic documentation for an available option, but you can also come up with a conditional statement along these lines:

export const searchCookies = enrichCloudFunction(async (req, res) => {
  const { query: { type, cookies, from, size } } = validateCookieQuery(req)
  const boolOptions = {
    must: [ { match: { 'cookie.id': cookie } } ]
  }
  if ( type ){
    boolOptions.must.push({ match: { type }})
  }
  const { hits: { hits } } = await elastic.search<ExtendedStuff>({
    from: from || 0,
    index: cookieIndex({ prefix: config.prefix }),
    query: { bool: boolOptions },
    size: size || 20,
  })
  res.json(hits.map((x) => x._source))
})