Restore "Upgrade to Lucene-7.6.0-snapshot-f9598f335b (#35225)"

This commit restores the upgrade to Lucene-7.6.0 snapshot that was reverted by
81daf4c.
The change should work now that master has been upgraded to a recent Lucene 8 snapshot.

Author: jimczi

buildSrc/version.properties

@@ -1,5 +1,5 @@
 elasticsearch     = 6.6.0
-lucene            = 7.5.0
+lucene            = 7.6.0-snapshot-f9598f335b
 
 # optional dependencies
 spatial4j         = 0.7

docs/Versions.asciidoc

@@ -0,0 +1 @@
+717fb4e5f1c1667819465805858731d6683f3ab4

modules/lang-expression/licenses/lucene-expressions-7.5.0.jar.sha1

@@ -75,7 +75,7 @@ public void testDefaults() throws Exception {
         IndexableField[] fields = doc.rootDoc().getFields("field");
         assertEquals(2, fields.length);
         IndexableField pointField = fields[0];
-        assertEquals(1, pointField.fieldType().pointDimensionCount());
+        assertEquals(1, pointField.fieldType().pointIndexDimensionCount());
         assertFalse(pointField.fieldType().stored());
         assertEquals(1230, pointField.numericValue().longValue());
         IndexableField dvField = fields[1];
@@ -149,7 +149,7 @@ public void testNoDocValues() throws Exception {
         IndexableField[] fields = doc.rootDoc().getFields("field");
         assertEquals(1, fields.length);
         IndexableField pointField = fields[0];
-        assertEquals(1, pointField.fieldType().pointDimensionCount());
+        assertEquals(1, pointField.fieldType().pointIndexDimensionCount());
         assertEquals(1230, pointField.numericValue().longValue());
     }
 
@@ -173,7 +173,7 @@ public void testStore() throws Exception {
         IndexableField[] fields = doc.rootDoc().getFields("field");
         assertEquals(3, fields.length);
         IndexableField pointField = fields[0];
-        assertEquals(1, pointField.fieldType().pointDimensionCount());
+        assertEquals(1, pointField.fieldType().pointIndexDimensionCount());
         assertEquals(1230, pointField.numericValue().doubleValue(), 0d);
         IndexableField dvField = fields[1];
         assertEquals(DocValuesType.SORTED_NUMERIC, dvField.fieldType().docValuesType());
@@ -202,7 +202,7 @@ public void testCoerce() throws Exception {
         IndexableField[] fields = doc.rootDoc().getFields("field");
         assertEquals(2, fields.length);
         IndexableField pointField = fields[0];
-        assertEquals(1, pointField.fieldType().pointDimensionCount());
+        assertEquals(1, pointField.fieldType().pointIndexDimensionCount());
         assertEquals(1230, pointField.numericValue().longValue());
         IndexableField dvField = fields[1];
         assertEquals(DocValuesType.SORTED_NUMERIC, dvField.fieldType().docValuesType());
@@ -317,7 +317,7 @@ public void testNullValue() throws IOException {
         IndexableField[] fields = doc.rootDoc().getFields("field");
         assertEquals(2, fields.length);
         IndexableField pointField = fields[0];
-        assertEquals(1, pointField.fieldType().pointDimensionCount());
+        assertEquals(1, pointField.fieldType().pointIndexDimensionCount());
         assertFalse(pointField.fieldType().stored());
         assertEquals(25, pointField.numericValue().longValue());
         IndexableField dvField = fields[1];

modules/lang-expression/licenses/lucene-expressions-7.6.0-snapshot-f9598f335b.jar.sha1

@@ -341,7 +341,7 @@ Tuple<List<BytesRef>, Map<String, List<byte[]>>> extractTermsAndRanges(IndexRead
                         extractedTerms.add(builder.toBytesRef());
                     }
                 }
-                if (info.getPointDimensionCount() == 1) { // not != 0 because range fields are not supported
+                if (info.getPointIndexDimensionCount() == 1) { // not != 0 because range fields are not supported
                     PointValues values = reader.getPointValues(info.name);
                     List<byte[]> encodedPointValues = new ArrayList<>();
                     encodedPointValues.add(values.getMinPackedValue().clone());

modules/mapper-extras/src/test/java/org/elasticsearch/index/mapper/ScaledFloatFieldMapperTests.java

@@ -0,0 +1 @@
+4eaf937aa95487a518d458666da78b68fff35ef4

modules/percolator/src/main/java/org/elasticsearch/percolator/PercolatorFieldMapper.java

@@ -0,0 +1 @@
+cdb7c83e29aa6c365e2c06c843ddfe16cfba12cc