Upgrade to Lucene 8.1.0 (#42214)

This commit upgrades to the GA release of Lucene 8.1.0

Author: jimczi

buildSrc/version.properties

@@ -1,5 +1,5 @@
 elasticsearch     = 7.3.0
-lucene            = 8.1.0-snapshot-e460356abe
+lucene            = 8.1.0
 
 bundled_jdk       = 12.0.1+12@69cfe15208a647278a19ef0990eea691
 

modules/lang-expression/licenses/lucene-expressions-8.1.0-snapshot-e460356abe.jar.sha1

@@ -0,0 +1 @@
+0c98e3b9d25f27ab05ac643cfb28756daa516bc7

modules/lang-expression/licenses/lucene-expressions-8.1.0.jar.sha1

@@ -0,0 +1 @@
+d61364290eb1c28696e62b7df3a7d041d3be2fa5

plugins/analysis-icu/licenses/lucene-analyzers-icu-8.1.0-snapshot-e460356abe.jar.sha1

@@ -0,0 +1 @@
+7f78b18890a0a0e74a8249806a6cfcabd2fae304

plugins/analysis-icu/licenses/lucene-analyzers-icu-8.1.0.jar.sha1

@@ -0,0 +1 @@
+bfc6b5d67a792aa23ee134fe93307696aad94223