Reduce NodeRunner.exe resource consumption...
|Use Set-SPEnterpriseSearchService -PerformanceLevel Reduced to reduce the CPU impact the search service|
|Modify the C:\Program Files\Microsoft Office Servers\15.0\Search\Runtime\1.0\noderunner.exe.config so that it can only consume X amount of RAM. Change the value at to any amount of RAM you like to contain the memory leak.|
|Do not forget to restart the search service so the modification could be effective.|