FHIRPath expression evaluation while performing FHIR search on Bundle using _fhirpath parameter does not return result

[codeforgreen]

Describe the bug
FHIRPath expression evaluation for SearchParameters and FHIRPath expression evaluation using the _fhirpath parameter is not in alignment. _fhirpath chokes on chained use of resolve(). This is most notable when using _fhirpath with FHIR Documents (i.e. Bundles of type document where entry[0] is a Composition).

To Reproduce
Steps to reproduce the behavior:

1. Create a Patient and a MedicationAdministration

PUT {{ baseUrl }}MedicationAdministration/dtest-medadmin-effectiveperiod-start

{
    "resourceType": "Patient",
    "id": "dtest-pat-identifier",
    "identifier":
    [
        {
            "system": "http://dtest.org/pat",
            "value": "123456789101112"
        }
    ]
}

PUT {{ baseUrl }}MedicationAdministration/dtest-medadmin-effectiveperiod-start

{
    "resourceType": "MedicationAdministration",
    "id": "dtest-medadmin-effectiveperiod-start",
    "effectivePeriod":
    {
        "start": "2023-07-01T01:00:00-05:00"
    }
}

3. Create a Bundle of type document with a Composite including the resources already created in step 1

PUT {{baseUrl}}Bundle/dtest-bdl-pat-medadmin-effectiveperiod-start

{
    "resourceType": "Bundle",
    "id": "dtest-bdl-pat-medadmin-effectiveperiod-start",
    "type": "document",
    "entry":
    [
        {
            "fullUrl": "http://dtest.org/fhir/Composition/dtest-comp-pat-medadmin-effectiveperiod-start",
            "resource":
            {
                "resourceType": "Composition",
                "id": "dtest-comp-pat-medadmin-effectiveperiod-start",
                "type":
                {
                    "coding":
                    [
                        {
                            "system": "http://loinc.org",
                            "code": "80565-5",
                            "display": "Medication administration record"
                        }
                    ]
                },
                "subject":
                {
                    "reference": "Patient/dtest-pat-identifier"
                },
                "section":
                [
                    {
                        "entry":
                        [
                            {
                                "reference": "MedicationAdministration/dtest-medadmin-effectiveperiod-start"
                            }
                        ]
                    }
                ]
            }
        },
        {
            "fullUrl": "http://dtest.org/fhir/Patient/dtest-pat-identifier",
            "resource":
            {
                "resourceType": "Patient",
                "id": "dtest-pat-identifier",
                "identifier":
                [
                    {
                        "system": "http://dtest.org/pat",
                        "value": "123456789101112"
                    }
                ]
            }
        },
        {
            "fullUrl": "http://example.com/fhir/MedicationAdministration/dtest-medadmin-effectiveperiod-start",
            "resource":
            {
                "resourceType": "MedicationAdministration",
                "id": "dtest-medadmin-effectiveperiod-start",
                "effectivePeriod":
                {
                    "start": "2023-07-01T01:00:00-05:00"
                }
            }
        }
    ]
}

5. Perform a search using the _fhirpath parameter

GET localhost:8000/Bundle/dtest-bdl-pat-medadmin-effectiveperiod-start?_fhirpath=Bundle.entry[0].resource.as(Composition).section.entry.resolve().as(MedicationAdministration).effective

{
    "resourceType": "Parameters",
    "parameter":
    [
        {
            "name": "result",
            "part":
            [
                {
                    "name": "expression",
                    "valueString": "Bundle.entry[0].resource.as(Composition).section.entry.resolve().as(MedicationAdministration).effective"
                }
            ]
        }
    ]
}

Expected behavior
The search should return:

{
	"resourceType": "Parameters",
	"parameter": [
		{
			"name": "result",
			"part": [
				{
					"name": "expression",
					"valueString": "Bundle.entry[0].resource.as(Composition).section.entry.resolve().as(MedicationAdministration).effective"
				},
				{
					"name": "result",
					"valuePeriod": {
						"start": "2023-07-01T01:00:00-05:00"
					}
				}
			]
		}
	]
}

Environment (please complete the following information):

• HAPI FHIR // 6.11.5-SNAPSHOT / build 65f1331 2023-12-05T10:14:45.968-05:00

Additional context
The same fhirPath expression works when used within a defined SearchParameter.

PUT {{baseUrl }}SearchParameter/Bundle-composition-entry-medicationadministration-effective-time

{
    "resourceType": "SearchParameter",
    "id": "Bundle-composition-entry-medicationadministration-effective-time",
    "url": "http://dtest.org/fhir/SearchParameter/Bundle-composition-entry-medicationadministration-effective-time",
    "status": "active",
    "name": "composition.entry.effective-time",
    "code": "composition.entry.effective-time",
    "base":
    [
        "Bundle"
    ],
    "type": "date",
    "expression": "Bundle.entry[0].resource.as(Composition).section.entry.resolve().as(MedicationAdministration).effective"
}

GET {{baseUrl }}Bundle?composition.entry.effective-time=ge2021

{
	"resourceType": "Bundle",
	"id": "637bf0f8-effa-4982-a7c6-12549be453b2",
	"meta": {
		"lastUpdated": "2023-12-20T19:56:35.648-08:00"
	},
	"type": "searchset",
	"total": 2,
	"link": [
		{
			"relation": "self",
			"url": "http://localhost:8000/Bundle?composition.entry.effective-time=ge2021"
		}
	],
	"entry": [
		{
			"fullUrl": "http://localhost:8000/Bundle/dtest-bdl-pat-medadmin-effectiveperiod-start",
			"resource": {
				"resourceType": "Bundle",
				"id": "dtest-bdl-pat-medadmin-effectiveperiod-start",
				"meta": {
					"versionId": "1",
					"lastUpdated": "2023-12-19T15:12:13.872-08:00",
					"source": "#ldCU7ue8EFAxtJZT"
				},
				"type": "document",
				"entry": [
					{
						"fullUrl": "http://dtest.org/fhir/Composition/dtest-comp-pat-medadmin-effectiveperiod-start",
						"resource": {
							"resourceType": "Composition",
							"id": "dtest-comp-pat-medadmin-effectiveperiod-start",
							"type": {
								"coding": [
									{
										"system": "http://loinc.org",
										"code": "80565-5",
										"display": "Medication administration record"
									}
								]
							},
							"subject": {
								"reference": "Patient/dtest-pat-identifier"
							},
							"section": [
								{
									"entry": [
										{
											"reference": "MedicationAdministration/dtest-medadmin-effectiveperiod-start"
										}
									]
								}
							]
						}
					},
					{
						"fullUrl": "http://dtest.org/fhir/Patient/dtest-pat-identifier",
						"resource": {
							"resourceType": "Patient",
							"id": "dtest-pat-identifier",
							"identifier": [
								{
									"system": "http://dtest.org/pat",
									"value": "123456789101112"
								}
							]
						}
					},
					{
						"fullUrl": "http://example.com/fhir/MedicationAdministration/dtest-medadmin-effectiveperiod-start",
						"resource": {
							"resourceType": "MedicationAdministration",
							"id": "dtest-medadmin-effectiveperiod-start",
							"effectivePeriod": {
								"start": "2023-07-01T01:00:00-05:00"
							}
						}
					}
				]
			},
			"search": {
				"mode": "match"
			}
	}
}