Upgrade to Lucene-7.4.0-snapshot-518d303506 (#31360)

Author: dnhatn

buildSrc/version.properties

@@ -1,5 +1,5 @@
 elasticsearch     = 6.4.0
-lucene            = 7.4.0-snapshot-0a7c3f462f
+lucene            = 7.4.0-snapshot-518d303506
 
 # optional dependencies
 spatial4j         = 0.7

modules/lang-expression/licenses/lucene-expressions-7.4.0-snapshot-0a7c3f462f.jar.sha1

@@ -0,0 +1 @@
+a57659a275921d8ab3f7ec580e9bf713ce6143b1

modules/lang-expression/licenses/lucene-expressions-7.4.0-snapshot-518d303506.jar.sha1

@@ -0,0 +1 @@
+b91a260d8d12ee4b3302a63059c73a34de0ce146

plugins/analysis-icu/licenses/lucene-analyzers-icu-7.4.0-snapshot-0a7c3f462f.jar.sha1

@@ -0,0 +1 @@
+cc1ca9bd9e2c162dd1da8c2e7111913fd8033e48

plugins/analysis-icu/licenses/lucene-analyzers-icu-7.4.0-snapshot-518d303506.jar.sha1

@@ -0,0 +1 @@
+2fa3662a10a9e085b1c7b87293d727422cbe6224