export default async function FieldCapsApi()

in src/api/api/field_caps.ts [47:91]
40 lines of code
10 McCabe index (conditional complexity)

export default async function FieldCapsApi (this: That, params?: T.FieldCapsRequest | TB.FieldCapsRequest, options?: TransportRequestOptions): Promise<T.FieldCapsResponse>
export default async function FieldCapsApi (this: That, params?: T.FieldCapsRequest | TB.FieldCapsRequest, options?: TransportRequestOptions): Promise<any> {
  const acceptedPath: string[] = ['index']
  const acceptedBody: string[] = ['fields', 'index_filter', 'runtime_mappings']
  const querystring: Record<string, any> = {}
  // @ts-expect-error
  const userBody: any = params?.body
  let body: Record<string, any> | string
  if (typeof userBody === 'string') {
    body = userBody
  } else {
    body = userBody != null ? { ...userBody } : undefined
  }

  params = params ?? {}
  for (const key in params) {
    if (acceptedBody.includes(key)) {
      body = body ?? {}
      // @ts-expect-error
      body[key] = params[key]
    } else if (acceptedPath.includes(key)) {
      continue
    } else if (key !== 'body') {
      // @ts-expect-error
      querystring[key] = params[key]
    }
  }

  let method = ''
  let path = ''
  if (params.index != null) {
    method = body != null ? 'POST' : 'GET'
    path = `/${encodeURIComponent(params.index.toString())}/_field_caps`
  } else {
    method = body != null ? 'POST' : 'GET'
    path = '/_field_caps'
  }
  const meta: TransportRequestMetadata = {
    name: 'field_caps',
    pathParts: {
      index: params.index
    }
  }
  return await this.transport.request({ path, method, querystring, body, meta }, options)
}