cloudant searching index by multiple values - couchdb

Question

Cloudant is returning error message:
{"error":"invalid_key","reason":"Invalid key use-index for this request."}
whenever I try to query against an index with the combination operator, "$or".
A sample of what my documents look like is:
{
"_id": "28f240f1bcc2fbd9e1e5174af6905349",
"_rev": "1-fb9a9150acbecd105f1616aff88c26a8",
"type": "Feature",
"properties": {
"PageName": "A8",
"PageNumber": 1,
"Lat": 43.051523,
"Long": -71.498852
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
-71.49978935969642,
43.0508382914137
],
[
-71.49978564033566,
43.052210148524
],
[
-71.49791499857444,
43.05220740550381
],
[
-71.49791875962663,
43.05083554852429
],
[
-71.49978935969642,
43.0508382914137
]
]
]
}
}
The index that I created is for field "properties.PageName", which works fine when I'm just querying for one document, but as soon as I try for multiple ones, I would receive the error response as quoted in the beginning.
If it helps any, here is the call:
POST https://xyz.cloudant.com/db/_find
request body:
{
"selector": {
"$or": [
{ "properties.PageName": "A8" },
{ "properties.PageName": "M30" },
{ "properties.PageName": "AH30" }
]
},
"use-index": "pagename-index"
}

Answer 1

In order to perform an $or query you need to create a text (full text) index, rather than a json index. For example, I just created the following index:
{
"index": {
"fields": [
{"name": "properties.PageName", "type": "string"}
]
},
"type": "text"
}
I was then be able to perform the following query:
{
"selector": {
"$or": [
{ "properties.PageName": "A8" },
{ "properties.PageName": "M30" },
{ "properties.PageName": "AH30" }
]
}
}