Add apply_checkpoints setting description

Author: przemekwitek

docs/reference/rest-api/common-parms.asciidoc

@@ -1005,6 +1005,14 @@ throttles the {transform} by adding a wait time between search requests. The
 default value is `null`, which disables throttling.
 end::transform-settings-docs-per-second[]
 
+tag::transform-settings-interim-results[]
+Specifies whether the transform checkpoint ranges should be optimized for performance.
+Such optimization can align checkpoint ranges with date histogram interval when date histogram
+is specified as a group source in the transform config. As an effect, less document updates in the
+destination index will be performed thus improving overall performance.
+The default value is `true`, which means the checkpoint ranges will be optimized if possible.
+end::transform-settings-interim-results[]
+
 tag::transform-settings-max-page-search-size[]
 Defines the initial page size to use for the composite aggregation for each
 checkpoint. If circuit breaker exceptions occur, the page size is dynamically

docs/reference/transform/apis/preview-transform.asciidoc

@@ -204,6 +204,9 @@ include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings]
 `docs_per_second`:::
 (Optional, float)
 include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-docs-per-second]
+`interim_results`:::
+(Optional, boolean)
+include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-interim-results]
 `max_page_search_size`:::
 (Optional, integer)
 include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-max-page-search-size]

docs/reference/transform/apis/put-transform.asciidoc

@@ -186,6 +186,9 @@ include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-dat
 `docs_per_second`:::
 (Optional, float)
 include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-docs-per-second]
+`interim_results`:::
+(Optional, boolean)
+include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-interim-results]
 `max_page_search_size`:::
 (Optional, integer)
 include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-max-page-search-size]

docs/reference/transform/apis/update-transform.asciidoc

@@ -138,6 +138,9 @@ include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-dat
 `docs_per_second`:::
 (Optional, float)
 include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-docs-per-second]
+`interim_results`:::
+(Optional, boolean)
+include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-interim-results]
 `max_page_search_size`:::
 (Optional, integer)
 include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-max-page-search-size]