Update to elasticsearch v7.16 to fix deprecation warning

[samhstn]

We see a deprecated folder mapping warning when using node v16+

(node:97520) [DEP0148] DeprecationWarning: Use of deprecated folder mapping "./" in the "exports" field module resolution of the package at /Users/marcbachmann/Development/livingdocsIO/livingdocs-server/master/node_modules/@elastic/elasticsearch7/package.json.
Update this package.json to use a subpath pattern like "./*".
...

Raised here: elastic/elasticsearch-js#1465
Fixed here: https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/changelog-client.html#_fixed_export_field_deprecation_log_1593

[samhstn]

@TheDeveloper any updates here?

[lbeschastny]

When using Node.js 20 it causes an error on module import:

Uncaught:
Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './lib/errors' is not defined by "exports" in /Users/leonbesc/Documents/viaplay/search-index-manager-lambda/search-index-manager-updater-lambda/node_modules/@elastic/elasticsearch/package.json
    at __node_internal_captureLargerStackTrace (node:internal/errors:496:5)
    at new NodeError (node:internal/errors:405:5)
    at exportsNotFound (node:internal/modules/esm/resolve:359:10)
    at packageExportsResolve (node:internal/modules/esm/resolve:695:9)
    at resolveExports (node:internal/modules/cjs/loader:567:36)
    at Module._findPath (node:internal/modules/cjs/loader:636:31)
    at Module._resolveFilename (node:internal/modules/cjs/loader:1063:27)
    at Module._load (node:internal/modules/cjs/loader:922:27)
    at Module.require (node:internal/modules/cjs/loader:1143:19)
    at require (node:internal/modules/cjs/helpers:110:18)
    at Object.<anonymous> (/Users/leonbesc/Documents/viaplay/search-index-manager-lambda/search-index-manager-updater-lambda/node_modules/aws-elasticsearch-js/index.js:11:5)
    at Module._compile (node:internal/modules/cjs/loader:1256:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1310:10)
    at Module.load (node:internal/modules/cjs/loader:1119:32)
    at Module._load (node:internal/modules/cjs/loader:960:12)
    at Module.require (node:internal/modules/cjs/loader:1143:19)
    at require (node:internal/modules/cjs/helpers:110:18) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}