[DOCS] Documented index.codec.bloom.load for #4525

docs/reference/index-modules/codec.asciidoc

@@ -141,6 +141,30 @@ following options:
 
 Type name: `bloom`
 
+[[codec-bloom-load]]
+[TIP]
+==================================================
+
+It can sometime make sense to disable bloom filters. For instance, if you are
+logging into an index per day, and you have thousands of indices, the bloom
+filters can take up a sizable amount of memory. For most queries you are only
+interested in recent indices, so you don't mind queries on older indices
+taking slightly longer.
+
+In these cases you can disable loading of the bloom filter on  a per-index
+basis by updating the index settings:
+
+[source,js]
+--------------------------------------------------
+PUT /old_index/_settings?index.codec.bloom.load=false
+--------------------------------------------------
+
+This setting, which defaults to `true`, can be updated on a live index. Note,
+however, that changing the value will cause the index to be reopened, which
+will invalidate any existing caches.
+
+==================================================
+
 [float]
 [[pulsing-postings]]
 ==== Pulsing postings format

docs/reference/indices/update-settings.asciidoc

@@ -59,6 +59,10 @@ settings API:
 `index.codec`::
     Codec. Default to `default`.
 
+`index.codec.bloom.load`::
+    Whether to load the bloom filter. Defaults to `true`.
+    See <<bloom-postings>>.
+
 `index.fail_on_merge_failure`::
     Default to `true`.