New Adaptivist ScriptRunner searchProvider method for Jira 8?

[Judah]

I am trying to refactor a Scriptrunner listener to work with the new Jira 8 updates. The listener should copy a custom field value from parent to all children on update. It was previously working w/ Jira 7.

Specifically, having trouble implementing searchProvider.search() method. Code block below...I have loads of new type check errors and don't know where to begin!!

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.issuetype.IssueType
import com.atlassian.jira.issue.util.DefaultIssueChangeHolder
import com.atlassian.jira.issue.IssueInputParameters
import com.atlassian.jira.issue.ModifiedValue
import com.atlassian.jira.bc.issue.*
import static com.atlassian.jira.workflow.TransitionOptions.Builder;
import com.atlassian.jira.issue.IssueManager;
import com.atlassian.jira.issue.link.IssueLinkManager
import com.atlassian.jira.issue.link.IssueLink
import org.apache.log4j.Logger
import org.apache.log4j.Level
import com.atlassian.jira.issue.search.SearchProvider
import com.atlassian.jira.jql.parser.JqlQueryParser
import com.atlassian.jira.web.bean.PagerFilter
import com.atlassian.jira.issue.index.IssueIndexingService;
import com.atlassian.jira.issue.search.IssueSearchResultsFactory;
import com.atlassian.jira.issue.search.DocumentSearchResultsFactory;

def log = Logger.getLogger("com.acme.debug")
log.setLevel(Level.DEBUG)
Issue issue = event.issue

def key = issue.getKey()
def customFieldManager = ComponentAccessor.getCustomFieldManager()
def issueManager = ComponentAccessor.getIssueManager();
def field = customFieldManager.getCustomFieldObjects(event.issue).find { it.name == "Priority Number" }
def issueService = ComponentAccessor.getIssueService()
def user = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser()

def jqlQueryParser = ComponentAccessor.getComponent(JqlQueryParser)
def searchProvider = ComponentAccessor.getComponent(SearchProvider)
def parentLink = customFieldManager.getCustomFieldObjectsByName('Parent Link') // getting the Parent Link custom field
def customFieldValue = issue.getCustomFieldValue(parentLink) // Parent Link field value
def parentKey = (String) customFieldValue
def parentIssue = issueManager.getIssueObject(parentKey) // Parent issue object
def parentValue = issue.getCustomFieldValue(field)

def jqlSearch = "issuetype in (Feature,'Forecasting Placeholder',Epic,Story)and status not in (Done,'Feature Post-Implementation','Feature Released') and issuekey in childIssuesOf(" + key + ")";
def query = jqlQueryParser.parseQuery(jqlSearch)

def results = searchProvider.search(query, user, PagerFilter.getUnlimitedFilter())

results.getResults().each {documentIssue ->;

def childIssue = issueManager.getIssueObject(documentIssue.id)
def changeHolder = new DefaultIssueChangeHolder()
def childValue = childIssue.getCustomFieldValue(field)
def issueIndexManager = ComponentAccessor.getComponent(IssueIndexingService)
field.updateValue(null, documentIssue, new ModifiedValue(childValue, parentValue), changeHolder)

issueIndexManager.reIndex(documentIssue)
}

 I have found my way here https://confluence.atlassian.com/jiracore/lucene-upgrade-975041047.html but I am so far, unable to translate these updates...

Any advice is appreciated! 

Logs: 

2019-09-24 12:36:25,462 ERROR [runner.AbstractScriptListener]: *************************************************************************************
2019-09-24 12:36:25,462 ERROR [runner.AbstractScriptListener]: Script function failed on event: com.atlassian.jira.event.issue.IssueEvent, file: <inline script>
groovy.lang.MissingMethodException: No signature of method: com.atlassian.jira.issue.search.providers.LuceneSearchProvider.search() is applicable for argument types: (com.atlassian.query.QueryImpl, com.atlassian.jira.user.DelegatingApplicationUser, com.atlassian.jira.web.bean.PagerFilter) values: [{issuetype in ("Feature", "Forecasting Placeholder", "Epic", "Story")} AND {status not in ("Done", "Feature Post-Implementation", "Feature Released")} AND {issuekey in childIssuesOf(ZSMBT-10)}, ...]
Possible solutions: search(com.atlassian.jira.issue.search.SearchQuery, com.atlassian.jira.web.bean.PagerFilter), search(com.atlassian.jira.issue.search.SearchQuery, com.atlassian.jira.web.bean.PagerFilter, java.util.Set), search(com.atlassian.jira.issue.search.SearchQuery, org.apache.lucene.search.Collector), each(groovy.lang.Closure)
	at Script402.run(Script402.groovy:49)