Searching by identifier in a coding system with the :of-type modifier does not work

**Describe the bug**
Searching for a patient by Identifier, using the of-type modifier presents the error: Only one token separator can be specified. This is necessary for Brazilian Documents, as the current profile does not specify a System for Brazilian Documents (RG and CPF)

Per the specification (https://www.hl7.org/fhir/search.html):

> :of-type | The search parameter has the format system\|code\|value, where the system and code refer to a Identifier.type.coding.system and .code, and match if any of the type codes match. **All 3 parts must be present**

**FHIR Version?**
R4

**Data provider?**
CosmosDB

**To Reproduce**
Steps to reproduce the behavior:
1. Insert a patient with value:
```
{
"resourceType": "Patient",
"identifier": [
{
"type": {
"coding": [
{
"system": "http://terminology.hl7.org/CodeSystem/v2-0203",
"code": "RRI",
"display": "RG"
}
],
"text": "RG"
},
"value": "1234"
}
]
}
```

2. Search using the URL: `https://xxxx.azurehealthcareapis.com/Patient?identifier:ofType=http://terminology.hl7.org/CodeSystem/v2-0203|RRI|1234`

**Expected behavior**
Patient should be returned.

**Actual behavior**
Error returned:

```
{
"resourceType": "OperationOutcome",
"id": "c3ce4e2e95f07948b6a6002f0dd20816",
"issue": [
{
"severity": "error",
"code": "structure",
"diagnostics": "Only one token separator can be specified."
}
]
}
```

Start by reproducing the R4 Patient search against CosmosDB with the provided :of-type URL and identifier data, then review closed pull request #2149 for prior context. Done means the three-part system|code|value query returns the patient without the token-separator error.

Written by the indexing model from the issue text.