Splunk Indexers Physicial memory usage high

Hi , I am currently experiencing high memory usage on my indexers when i saw the memory usage , i saw a high amount of memory caches below, total used free shared buffers cached Mem: 516761 477169 39592 0 1158 457892 -/+ buffers/cache: 18117 498644 Swap: 51199 551 50648 How safe is it to clear buffers and cache ? If i clear caches is it will create any issue like deleting data make indexers down ? I am thinking to clear it using these commands : sync; echo 1 > /proc/sys/vm/drop_caches. sync; echo 3 > /proc/sys/vm/drop_caches