Wildcard-querying an array with forward slash in the query - elasticsearch

Question

In my documents indexed by elasticsearch, I have a field called IPC8s.IPC8 which is an array of strings, which can look like these :
["B63H011/00"]
["B60F3", "B60K1", "B60K17", "B60K17/23", "B60K6", "B60K6"]
["G06F017/00"]
etc...
(for anyone curious, these are CPC patent classification numbers)
I need to query this field with trailing wildcards. In other words, if I put in "B63H", the document containing "B63H011/00" should match. Same if I put in "B63H011/" or "B63H011/0".
I tried multiple queries, none of which worked :
{
query_string: {
default_field: "IPC8s.IPC8",
query: "(B63H*) OR (B63H011/*)",
analyze_wildcard: true
}
}
I tried this one also with \"B63H*\" OR \"B63H011/*\", doesn't work.
Then I tried :
[{
wildcard: {
"IPC8s.IPC8": { value: "B63H*" }
}
},
{
wildcard: {
"IPC8s.IPC8": { value: "B63H011/*" }
}
}]
This doesn't work either. I then tried escaping the "/" because it has to be taken literally. Didn't work.
What am I doing wrong ? Thanks.
Edit : Here is the mapping for that specific field :
"IPC8s": {
"properties": {
"IPC8": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
}
Here is my latest try that still didn't work (if I don't escape the forward slash, elasticsearch returns an error) :
{
query_string: {
default_field: "IPC8s.IPC8",
query: "(B63H*) OR (B63H011\\/*)",
analyze_wildcard: true,
analyzer: "keyword"
}
}
Edit 2 : This seems to do the trick :
{
query_string: {
default_field: "IPC8s.IPC8.keyword",
query: "(B63H*) OR (B63H011\\/*)",
analyze_wildcard: true,
analyzer: "keyword"
}
}

Answer 1

Text type with standard analyzer will create following token, hence you are not able to search on /
{
"tokens" : [
{
"token" : "b63h011",
"start_offset" : 0,
"end_offset" : 7,
"type" : "<ALPHANUM>",
"position" : 0
},
{
"token" : "00",
"start_offset" : 8,
"end_offset" : 10,
"type" : "<NUM>",
"position" : 1
}
]
}
Create a subfield for IPC8 with type keyword, which will store text as it is
GET index21/_search
{
"query": {
"wildcard": {
"IPC8s.IPC8.keyword": {
"value": "B63H011/*"
}
}
}
}`