diff --git a/fixtures/cassettes/merger/position.json b/fixtures/cassettes/merger/position.json
index 8dfe0121..dcdb7224 100644
--- a/fixtures/cassettes/merger/position.json
+++ b/fixtures/cassettes/merger/position.json
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-                "uri": "https://as.rockarch.org/api/search?fields%5B%5D=uri&page=1&page_size=1&q=%7B%21terms+f%3Dancestors%7D%2Frepositories%2F2%2Farchival_objects%2F487348%2C%2Frepositories%2F2%2Farchival_objects%2F487349%2C%2Frepositories%2F2%2Farchival_objects%2F487350%2C%2Frepositories%2F2%2Farchival_objects%2F487351%2C%2Frepositories%2F2%2Farchival_objects%2F487352%2C%2Frepositories%2F2%2Farchival_objects%2F487353%2C%2Frepositories%2F2%2Farchival_objects%2F487354%2C%2Frepositories%2F2%2Farchival_objects%2F487355%2C%2Frepositories%2F2%2Farchival_objects%2F487356%2C%2Frepositories%2F2%2Farchival_objects%2F487357%2C%2Frepositories%2F2%2Farchival_objects%2F487358%2C%2Frepositories%2F2%2Farchival_objects%2F487359%2C%2Frepositories%2F2%2Farchival_objects%2F487360%2C%2Frepositories%2F2%2Farchival_objects%2F487361%2C%2Frepositories%2F2%2Farchival_objects%2F487362%2C%2Frepositories%2F2%2Farchival_objects%2F487363%2C%2Frepositories%2F2%2Farchival_objects%2F487364%2C%2Frepositories%2F2%2Farchival_objects%2F487365%2C%2Frepositories%2F2%2Farchival_objects%2F487366%2C%2Frepositories%2F2%2Farchival_objects%2F487367%2C%2Frepositories%2F2%2Farchival_objects%2F487368+AND+publish%3Atrue&type%5B%5D=archival_object",
+                "uri": "https://as.rockarch.org/api/search?q=ancestors:%22/repositories/2/archival_objects/487348%22%20ancestors:%22/repositories/2/archival_objects/487349%22%20ancestors:%22/repositories/2/archival_objects/487350%22%20ancestors:%22/repositories/2/archival_objects/487351%22%20ancestors:%22/repositories/2/archival_objects/487352%22%20ancestors:%22/repositories/2/archival_objects/487353%22%20ancestors:%22/repositories/2/archival_objects/487354%22%20ancestors:%22/repositories/2/archival_objects/487355%22%20ancestors:%22/repositories/2/archival_objects/487356%22%20ancestors:%22/repositories/2/archival_objects/487357%22%20ancestors:%22/repositories/2/archival_objects/487358%22%20ancestors:%22/repositories/2/archival_objects/487359%22%20ancestors:%22/repositories/2/archival_objects/487360%22%20ancestors:%22/repositories/2/archival_objects/487361%22%20ancestors:%22/repositories/2/archival_objects/487362%22%20ancestors:%22/repositories/2/archival_objects/487363%22%20ancestors:%22/repositories/2/archival_objects/487364%22%20ancestors:%22/repositories/2/archival_objects/487365%22%20ancestors:%22/repositories/2/archival_objects/487366%22%20ancestors:%22/repositories/2/archival_objects/487367%22%20ancestors:%22/repositories/2/archival_objects/487368%22&filter_query%5B%5D=publish:true&page=1&fields%5B%5D=uri&type%5B%5D=archival_object&page_size=1",
                 "body": null,
                 "headers": {
                     "User-Agent": [
@@ -2325,7 +2325,7 @@
         {
             "request": {
                 "method": "GET",
-                "uri": "https://as.rockarch.org/api/search?fields%5B%5D=uri&page=1&page_size=1&q=%7B%21terms+f%3Dancestors%7D%2Frepositories%2F2%2Farchival_objects%2F487169%2C%2Frepositories%2F2%2Farchival_objects%2F487201%2C%2Frepositories%2F2%2Farchival_objects%2F487204%2C%2Frepositories%2F2%2Farchival_objects%2F487270%2C%2Frepositories%2F2%2Farchival_objects%2F487275%2C%2Frepositories%2F2%2Farchival_objects%2F487278%2C%2Frepositories%2F2%2Farchival_objects%2F487280%2C%2Frepositories%2F2%2Farchival_objects%2F487282%2C%2Frepositories%2F2%2Farchival_objects%2F487285%2C%2Frepositories%2F2%2Farchival_objects%2F487287%2C%2Frepositories%2F2%2Farchival_objects%2F487289%2C%2Frepositories%2F2%2Farchival_objects%2F487291%2C%2Frepositories%2F2%2Farchival_objects%2F487293%2C%2Frepositories%2F2%2Farchival_objects%2F487304%2C%2Frepositories%2F2%2Farchival_objects%2F487307%2C%2Frepositories%2F2%2Farchival_objects%2F487311%2C%2Frepositories%2F2%2Farchival_objects%2F487316%2C%2Frepositories%2F2%2Farchival_objects%2F487319%2C%2Frepositories%2F2%2Farchival_objects%2F487322%2C%2Frepositories%2F2%2Farchival_objects%2F487324%2C%2Frepositories%2F2%2Farchival_objects%2F487334+AND+publish%3Atrue&type%5B%5D=archival_object",
+                "uri": "https://as.rockarch.org/api/search?q=ancestors:%22/repositories/2/archival_objects/487169%22%20ancestors:%22/repositories/2/archival_objects/487201%22%20ancestors:%22/repositories/2/archival_objects/487204%22%20ancestors:%22/repositories/2/archival_objects/487270%22%20ancestors:%22/repositories/2/archival_objects/487275%22%20ancestors:%22/repositories/2/archival_objects/487278%22%20ancestors:%22/repositories/2/archival_objects/487280%22%20ancestors:%22/repositories/2/archival_objects/487282%22%20ancestors:%22/repositories/2/archival_objects/487285%22%20ancestors:%22/repositories/2/archival_objects/487287%22%20ancestors:%22/repositories/2/archival_objects/487289%22%20ancestors:%22/repositories/2/archival_objects/487291%22%20ancestors:%22/repositories/2/archival_objects/487293%22%20ancestors:%22/repositories/2/archival_objects/487304%22%20ancestors:%22/repositories/2/archival_objects/487307%22%20ancestors:%22/repositories/2/archival_objects/487311%22%20ancestors:%22/repositories/2/archival_objects/487316%22%20ancestors:%22/repositories/2/archival_objects/487319%22%20ancestors:%22/repositories/2/archival_objects/487322%22%20ancestors:%22/repositories/2/archival_objects/487324%22%20ancestors:%22/repositories/2/archival_objects/487334%22&filter_query%5B%5D=publish:true&page=1&fields%5B%5D=uri&type%5B%5D=archival_object&page_size=1",
                 "body": null,
                 "headers": {
                     "User-Agent": [
@@ -2493,7 +2493,7 @@
         {
             "request": {
                 "method": "GET",
-                "uri": "https://as.rockarch.org/api/search?fields%5B%5D=uri&page=1&page_size=1&q=%7B%21terms+f%3Dancestors%7D%2Frepositories%2F2%2Farchival_objects%2F484806%2C%2Frepositories%2F2%2Farchival_objects%2F486644%2C%2Frepositories%2F2%2Farchival_objects%2F486725+AND+publish%3Atrue&type%5B%5D=archival_object",
+                "uri": "https://as.rockarch.org/api/search?q=ancestors:%22/repositories/2/archival_objects/484806%22%20ancestors:%22/repositories/2/archival_objects/486644%22%20ancestors:%22/repositories/2/archival_objects/486725%22&filter_query%5B%5D=publish:true&page=1&fields%5B%5D=uri&type%5B%5D=archival_object&page_size=1",
                 "body": null,
                 "headers": {
                     "User-Agent": [
@@ -2791,7 +2791,7 @@
         {
             "request": {
                 "method": "GET",
-                "uri": "https://as.rockarch.org/api/search?fields%5B%5D=uri&page=1&page_size=1&q=%7B%21terms+f%3Dancestors%7D%2Frepositories%2F2%2Farchival_objects%2F892774%2C%2Frepositories%2F2%2Farchival_objects%2F892775+AND+publish%3Atrue&type%5B%5D=archival_object",
+                "uri": "https://as.rockarch.org/api/search?q=ancestors:%22/repositories/2/archival_objects/892774%22%20ancestors:%22/repositories/2/archival_objects/892775%22&filter_query%5B%5D=publish:true&page=1&fields%5B%5D=uri&type%5B%5D=archival_object&page_size=1",
                 "body": null,
                 "headers": {
                     "User-Agent": [
diff --git a/merger/helpers.py b/merger/helpers.py
index 4413cf62..51b1c92d 100644
--- a/merger/helpers.py
+++ b/merger/helpers.py
@@ -143,8 +143,9 @@ def tree_node(self, resource_uri, node_uri):
     def objects_within(self, uri_list):
         """Gets the number of objects which have a URI in their ancestors array."""
         count = 0
-        for chunk in list_chunks(uri_list, 190):
-            search_uri = f"search?q={{!terms f=ancestors}}{','.join(chunk)} AND publish:true&page=1&fields[]=uri&type[]=archival_object&page_size=1"
+        for chunk in list_chunks(uri_list, 100):
+            ancestors_param = ' '.join([f'ancestors:"{c}"' for c in chunk])
+            search_uri = f"search?q={ancestors_param}&filter_query[]=publish:true&page=1&fields[]=uri&type[]=archival_object&page_size=1"
             result = self.aspace.client.get(search_uri)
             try:
                 data = result.json()