diff --git a/DESCRIPTION b/DESCRIPTION
index 65c1628..75f4bc7 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -3,7 +3,7 @@ Type: Package
 Title: Controlling amcat4 from R
 Description: More about what it does (maybe more than one line)
     Use four spaces when indenting paragraphs within the Description.
-Version: 4.0.12.9000
+Version: 4.0.14.9000
 Authors@R: 
     c(person(given = "Wouter", 
              family = "van Atteveldt", 
diff --git a/R/index.R b/R/index.R
index e82cbb0..2ef155c 100644
--- a/R/index.R
+++ b/R/index.R
@@ -38,6 +38,7 @@ delete_index <- function(index, credentials = NULL) {
 #' @param name optional more descriptive name of the index to create (all
 #'   characters are allowed here)
 #' @param description optional description of the index to create
+#' @param create_fields create fields in the new index.
 #' @param guest_role Role for unauthorized users. Options are "admin", "writer",
 #'   "reader" and "metareader".
 #' @param credentials The credentials to use. If not given, uses last login
@@ -59,17 +60,26 @@ delete_index <- function(index, credentials = NULL) {
 #' }
 #'
 #' @export
-create_index <- function(index, name = index, description = NULL, guest_role = NULL, credentials = NULL) {
-  if (!is.null(guest_role)) guest_role <- tolower(guest_role)
+create_index <- function(index,
+                         name = index,
+                         description = NULL,
+                         create_fields = list(title = "text", date = "date", text = "text"),
+                         guest_role = NULL,
+                         credentials = NULL) {
+  if (!is.null(guest_role)) guest_role <- toupper(guest_role)
   body <- list(id = index, name = name, description = description, guest_role = guest_role)
-  invisible(request(credentials, "index/", body = body, "POST"))
+  resp <- request(credentials, "index/", body = body, "POST")
+  if (!is.null(create_fields)) {
+    set_fields(index, create_fields)
+  }
+  invisible(resp)
 }
 
 
 #' @describeIn create_index Modify an index
 #' @export
 modify_index <- function(index, name = index, description = NULL, guest_role = NULL, credentials = NULL) {
-  if (!is.null(guest_role)) guest_role <- tolower(guest_role)
+  if (!is.null(guest_role)) guest_role <- toupper(guest_role)
   body <- list(name = name, description = description, guest_role = guest_role)
   invisible(request(credentials, c("index/", index), body = body, "PUT"))
 }
@@ -236,7 +246,7 @@ refresh_index <- function(index, credentials = NULL) {
 #' @param credentials The credentials to use. If not given, uses last login information
 #' @export
 set_fields <- function(index, fields, credentials = NULL) {
-  invisible(request(credentials, c("index", index, "fields"), "POST", body = fields))
+  invisible(request(credentials, c("index", index, "fields"), "POST", body = as.list(fields)))
 }
 
 
@@ -246,7 +256,15 @@ set_fields <- function(index, fields, credentials = NULL) {
 #' @param credentials The credentials to use. If not given, uses last login information
 #' @export
 get_fields <- function(index, credentials = NULL) {
-  request(credentials, c("index", index, "fields")) |>
-    purrr::map_df(function(t) tibble::tibble(name = t$name, type = t$type))
+  res <- request(credentials, c("index", index, "fields"))
+  purrr::map(names(res), function(f) {
+    tibble::tibble(name = f,
+                   type = purrr::pluck(res[[f]], "type"),
+                   elastic_type = purrr::pluck(res[[f]], "elastic_type"),
+                   identifier = purrr::pluck(res[[f]], "identifier"),
+                   metareader = list(purrr::pluck(res[[f]], "metareader")),
+                   client_settings = list(purrr::pluck(res[[f]], "client_settings")))
+  }) |>
+    purrr::list_rbind()
 }
 
diff --git a/R/lib.R b/R/lib.R
index 01c74fc..d27ae6c 100644
--- a/R/lib.R
+++ b/R/lib.R
@@ -91,7 +91,11 @@ amcat_error_body <- function(resp) {
   if (grepl("json", httr2::resp_content_type(resp), fixed = TRUE)) {
     ebody <- httr2::resp_body_json(resp)
 
-    if (is.list(ebody$detail$body$error)) {
+    if (purrr::pluck_exists(ebody, "message")) {
+      return(purrr::pluck(ebody, "message"))
+    } else if (purrr::pluck_exists(ebody, "detail")) {
+      return(purrr::pluck(ebody, "detail"))
+    } else if (is.list(ebody$detail$body$error)) {
       error <- purrr::map_chr(names(ebody$detail$body$error), function(n) {
         paste0(tools::toTitleCase(n), ": ", ebody$detail$body$error[[n]])
       })
diff --git a/R/query.R b/R/query.R
index 291732c..02bd6e2 100644
--- a/R/query.R
+++ b/R/query.R
@@ -78,7 +78,7 @@ query_documents <- function(index,
                             queries = NULL,
                             fields = c("date", "title"),
                             filters = NULL,
-                            per_page = 1000,
+                            per_page = 200,
                             max_pages = 1,
                             page = NULL,
                             merge_tags = ";",
diff --git a/R/users.R b/R/users.R
index 8f1c656..b721ed7 100644
--- a/R/users.R
+++ b/R/users.R
@@ -4,7 +4,7 @@
 #'   information.
 #'
 #' @export
-list_users <- function(credentials=NULL) {
+list_users <- function(credentials = NULL) {
   request(credentials, c("users")) |> dplyr::bind_rows()
 }
 
@@ -21,6 +21,7 @@ list_users <- function(credentials=NULL) {
 modify_user <- function(email,
                         role = "writer",
                         credentials = NULL) {
+  if (!is.null(role)) role <- toupper(role)
   body = list(
     role = role
   )
@@ -42,6 +43,7 @@ create_user <- function(email,
                         role = "writer",
                         index_access = NULL,
                         credentials = NULL) {
+  if (!is.null(role)) role <- toupper(role)
   body <- list(
     email = email, role = role,
     index_access = index_access
diff --git a/README.Rmd b/README.Rmd
index aae8d67..588f0d9 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -31,3 +31,9 @@ You can install the development version of amcat4r from [GitHub](https://github.
 # install.packages("devtools")
 remotes::install_github("ccs-amsterdam/amcat4r")
 ```
+
+Note: if you have an amcat4 instance older than 4.0.14, you can use this version of the package:
+
+``` r
+remotes::install_github("ccs-amsterdam/amcat4r", ref = "3943ef527315e76205f258b34a3b9d14a67b5f72")
+```
diff --git a/README.md b/README.md
index 30b73e3..586cede 100644
--- a/README.md
+++ b/README.md
@@ -23,3 +23,9 @@ You can install the development version of amcat4r from
 # install.packages("devtools")
 remotes::install_github("ccs-amsterdam/amcat4r")
 ```
+
+Note: if you have an amcat4 instance older than 4.0.14, you can use this version of the package:
+
+``` r
+remotes::install_github("ccs-amsterdam/amcat4r", ref = "3943ef527315e76205f258b34a3b9d14a67b5f72")
+```
diff --git a/tests/testthat/test-index.R b/tests/testthat/test-index.R
index eab20b7..0f2e710 100644
--- a/tests/testthat/test-index.R
+++ b/tests/testthat/test-index.R
@@ -55,15 +55,15 @@ test_that("date conversion", {
   upload_documents("amcat4r-test", documents = test_doc)
   Sys.sleep(2) # seems to take a second
   expect_equivalent(
-    query_documents("amcat4r-test", queries = NULL, fields = NULL)$date,
-    strptime("2022-01-01", format =  "%Y-%m-%d")
+    as.character(query_documents("amcat4r-test", queries = NULL, fields = NULL)$date),
+    "2022-01-01"
   )
 
   update_documents("amcat4r-test", ids = "1", documents = data.frame(date = "2022-01-01T00:00:01"))
   Sys.sleep(2) # seems to take a second
   expect_equivalent(
-    query_documents("amcat4r-test", queries = NULL, fields = NULL)$date,
-    strptime("2022-01-01T00:00:01", format =  "%Y-%m-%dT%H:%M:%S")
+    as.character(query_documents("amcat4r-test", queries = NULL, fields = NULL)$date),
+    "2022-01-01 00:00:01"
   )
 })
 
@@ -71,7 +71,7 @@ test_that("users", {
   skip_if(as.logical(Sys.getenv("amcat_offline")))
 
   expect_false(
-    "test" %in% list_index_users("amcat4r-test")$email
+    "test" %in% purrr::pluck(list_index_users("amcat4r-test"), "email")
   )
 
   expect_true({
@@ -86,7 +86,7 @@ test_that("users", {
 
   expect_false({
     delete_index_user("amcat4r-test", email = "test")
-    "test" %in% list_index_users("amcat4r-test")$email
+    "test" %in% purrr::pluck(list_index_users("amcat4r-test"), "email")
   })
 
 })
@@ -96,14 +96,14 @@ test_that("fields", {
 
   expect_equal(
     dim(get_fields("amcat4r-test")),
-    c(4, 2)
+    c(3, 6)
   )
 
   expect_equal({
     set_fields("amcat4r-test", list(test = "keyword"))
     out <- get_fields("amcat4r-test")
     c(dim(out), out[out$name == "test", "type"])
-  }, list(5L, 2L, type = "keyword"))
+  }, list(4L, 6L, type = "keyword"))
 
 })
 
diff --git a/tests/testthat/test-query.R b/tests/testthat/test-query.R
index bf906ca..d1fa1da 100644
--- a/tests/testthat/test-query.R
+++ b/tests/testthat/test-query.R
@@ -4,7 +4,8 @@ if (!as.logical(Sys.getenv("amcat_offline")))
 test_that("query", {
   skip_if(as.logical(Sys.getenv("amcat_offline")))
   create_index("amcat4r-test")
-  set_fields("amcat4r-test", list(keyword = "keyword"))
+  set_fields("amcat4r-test", list(keyword = "keyword",
+                                  cats = "keyword"))
   test_doc <- data.frame(
     .id = 1:10,
     title = "test",
@@ -72,11 +73,13 @@ test_that("query", {
                     queries = "test",
                     filters = list(cats = "cute",
                                    date = list(gte = "2023-01-01")))$n,
-    4
+    5L
   )
 
   expect_equal({
     set_fields("amcat4r-test", list(test = "tag"))
+    # TODO: remove, admin should have automatic access
+    add_index_user("amcat4r-test", email = "_admin", role = "ADMIN")
     update_tags(
       index = "amcat4r-test",
       action = "add",
@@ -87,7 +90,7 @@ test_that("query", {
     )
     Sys.sleep(2) # seems to take a second to work
     sum(is.na(query_documents("amcat4r-test", queries = NULL, fields = c("test", "title"), scroll = "1m")))},
-    6L
+    5L
   )
 
   expect_equal({