update field docs for free memory (#15300)

elastic · Jan 3, 2020 · 04189ab · 04189ab
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diff --git a/metricbeat/docs/fields.asciidoc b/metricbeat/docs/fields.asciidoc
@@ -31029,7 +31029,7 @@ format: bytes
 *`system.memory.actual.free`*::
 +
 --
-Actual free memory in bytes. It is calculated based on the OS. On Linux it consists of the free memory plus caches and buffers. On OSX it is a sum of free memory and the inactive memory. On Windows, it is equal to `system.memory.free`.
+Actual free memory in bytes. It is calculated based on the OS. On Linux this value will be MemAvailable from /proc/meminfo,  or calculated from free memory plus caches and buffers if /proc/meminfo is not available. On OSX it is a sum of free memory and the inactive memory. On Windows, it is equal to `system.memory.free`.
 
 
 type: long

diff --git a/metricbeat/module/system/fields.go b/metricbeat/module/system/fields.go