Mention running "pelias elastic alias" in the README setup instructions

[toolness]

Step 5 of the README appeared to work successfully, but then when I inspected the output of curl -s localhost:4000/v1/autocomplete?text=1415%20ave%20w more closely, I noticed there were some errors:

{
  "geocoding": {
    "version": "0.2",
    "attribution": "http://localhost:4000/attribution",
    "query": {
      /* Leaving this out for brevity... */
    },
    "errors": [
      "[index_not_found_exception] no such index, with { resource.type=\"index_or_alias\" & resource.id=\"pelias\" & index_uuid=\"_na_\" & index=\"pelias\" }"
    ],
    "engine": {
      "name": "Pelias",
      "author": "Mapzen",
      "version": "1.0"
    },
    "timestamp": 1599158975509
  },
  "type": "FeatureCollection",
  "features": []
}

I kept looking through the README and noticed at the very bottom, in the section on "Updating PAD Data", there was a mention of running pelias elastic alias to "update the API ES alias to point to the new index". The words "alias" and "index" were also in the above error JSON so I thought maybe running that might fix it, and it did!

So it sounds like maybe step 5 of the README should also mention running pelias elastic alias too?

[SPTKL]

I'm not familiar with elastic search index but when I set

labs-geosearch-docker/pelias.json

Line 9 in 5b2d889

"indexName": "nycpad_VERSION"

to be the same as

labs-geosearch-docker/pelias.json

Line 18 in 5b2d889

"indexName": "pelias"

curl -s localhost:4000/v1/autocomplete?text=1415%20ave%20w seems to be working