forEachOrdered() instead of forEach()

(from github.com/imaikazuki)
https://github.com/codelibs/fess/blob/d19f020cca1118bdfedf7c63bf950212305a3359/src/main/java/org/codelibs/fess/helper/WebFsIndexHelper.java#L278
https://github.com/codelibs/fess/blob/d19f020cca1118bdfedf7c63bf950212305a3359/src/main/java/org/codelibs/fess/helper/WebFsIndexHelper.java#L298

According to Java Stream API, forEach() does not guarantee order. It’s more safe and stable to use forEachOrdered().

For parallel stream pipelines, this operation does not guarantee to respect the encounter order of the stream

(from github.com/marevol)
It’s not parallel stream pipelines.